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Browse free open source Calendar software and projects below. Use the toggles on the left to filter open source Calendar software by OS, license, language, programming language, and project status.

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  • 1
    Vtiger CRM

    Vtiger CRM

    An enterprise-class CRM and more!

    Vtiger CRM enables sales, support, and marketing teams to organize and collaborate to measurably improve customer experiences and business outcomes. Vtiger CRM also includes email, inventory, project management, and other tools, providing a complete the business management suite. Download Vtiger CRM here or sign up for a free 15-day free trial of the cloud-based application with free updates and support at https://www.vtiger.com/
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    Downloads: 1,034 This Week
    Last Update:
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  • 2
    DavMail POP/IMAP/SMTP/Caldav to Exchange
    Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP gateway allowing users to use any mail client with Exchange and Office 365, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows
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    Downloads: 464 This Week
    Last Update:
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  • 3
    Outlook CalDav Synchronizer

    Outlook CalDav Synchronizer

    Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server

    Free Outlook Plugin, which synchronizes events, tasks and contacts between Outlook and Google, SOGo, NextCloud, Horde or any other CalDAV or CardDAV server. Supported Outlook versions are 2021, 2019, 2016, 2013, 2010 and 2007 and Office 365 for Desktop. This project was initially developed as a master thesis project at the University of Applied Sciences Technikum Wien, Software Engineering Degree program. Outlook CalDav Synchronizer is Free and Open-Source Software (FOSS), still you can support the project by donating on Sourceforge or directly within the About dialog of our Plugin. Contact us for enterprise support at https://caldavsynchronizer.org/enterprise/contact
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    Downloads: 430 This Week
    Last Update:
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  • 4
    FullCalendar

    FullCalendar

    Full-sized drag & drop event calendar

    FullCalendar generates real React virtual DOM nodes so you can leverage Fiber, React's highly optimized rendering engine. With over 300 settings, and more being added every release, FullCalendar can do just about anything. Reduce your project's bundle size by using FullCalendar's modular plugins. With over 10 years of open source and over 100 contributors, FullCalendar will always have a free and open source core. Level-up by purchasing premium plugins and support. FullCalendar seamlessly integrates with the React JavaScript framework. It provides a component that exactly matches the functionality of FullCalendar’s standard API. This is more than a mere “connector”. It tells the core FullCalendar package to begin rendering with React virtual DOM nodes as opposed to the Preact nodes it normally uses, transforming FullCalendar into a “real” React component. You can learn a bit more from this blog post (more info to come).
    Downloads: 34 This Week
    Last Update:
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  • 5
    Group Office groupware and CRM

    Group Office groupware and CRM

    Take your office and CRM into the cloud!

    Installation instructions can be found here: https://groupoffice.readthedocs.io/en/latest/install/install.html Group Office is an open source groupware application. It makes your daily office tasks easier. Share projects, calendars, files and e-mail online. It is a complete solution for all your online office needs. From a customer phone call to a project and finally an invoice. The support system helps to keep your customers happy. Group Office is fast, secure and has privacy by design. You can stay in full control of your data by self hosting your cloud and e-mail. Our document editing solution keeps all data on the secured server instead of synchronising it to all user devices. GroupOffice is open source and modular. Which means it’s easy to customise and extend. You can turn off and on features and it enables any developer to create new modules for the platform.
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    Downloads: 113 This Week
    Last Update:
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  • 6
    bootstrap-datepicker

    bootstrap-datepicker

    A datepicker for twitter bootstrap

    Bootstrap-datepicker provides a flexible datepicker widget in the Bootstrap style. Versions are incremented according to semver. As with bootstrap’s own plugins, datepicker provides a data-api that can be used to instantiate datepickers without the need for custom javascript. You can disable datepicker’s data-api in the same way as you would disable other bootstrap plugins. Most options can be provided via data-attributes. An option can be converted to a data-attribute by taking its name, replacing each uppercase letter with its lowercase equivalent preceded by a dash, and prepending “data-date-” to the result. Methods are called on a datepicker by calling the datepicker function with a string first argument, followed by any arguments the method takes.
    Downloads: 16 This Week
    Last Update:
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  • 7
    !!We've Moved to GitHub at http://github.com/libical !!The code here on SourceForge is frozen !!Please follow us at http://libical.github.io/libical The Free Association project maintains libical, an open source reference implementation of the icalendar data type and serialization format. libical is used in dozens of calendaring and scheduling products.
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    Downloads: 41 This Week
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  • 8
    Osmo
    Osmo is a handy personal organizer, which includes calendar, tasks manager, address book and notes modules. It was designed to be a small, easy to use and good looking PIM tool to help to manage personal information.
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    Downloads: 36 This Week
    Last Update:
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  • 9
    Simple Calendar

    Simple Calendar

    A simple calendar with events, customizable widgets and no ads

    The most handy calendar out there. Manage your events and reminders easily. Simple Calendar Pro is a really flexible calendar with many event related options. It offers powerful repetition rules, optional CalDAV synchronization, ics file handling and much more. Top notch design ensures the best possible user experience. You will get familiar with it really quickly. You can create new events really quickly by predefining default values, or by duplicating existing events. There are many views you can choose from, depending on your preference. No matter if you want to see just 1 day or 1 year, this app supports it. Personalize your experience by changing any app color. You can even change the apps' icon color to make sure it matches your home screen. The Pro one already has many new features including time zone support, attendees and email type of reminders in CalDAV synced events, then many other bugfixes and stability improvements.
    Downloads: 6 This Week
    Last Update:
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  • 10
    RedNotebook is a graphical diary and journal helping you to keep track of notes and thoughts. It includes a calendar navigation, customizable templates for each day, export functionality and word clouds. You can also format, tag and search your entries. Please find the latest releases at https://rednotebook.app
    Downloads: 28 This Week
    Last Update:
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  • 11
    Outlook Google Calendar Sync

    Outlook Google Calendar Sync

    Sync your Outlook and Google calendars

    Offers calendar synchronization between Outlook and Google, including attendees and reminders. Completely free, no install necessary, works behind web proxies and actively developed. Supports all versions of Outlook from 2003 to 2019/Microsoft365 64-bit! Installable and portable options - even runs from a USB thumbdrive. Synchronises items in any calendar folder, including those shared with you. Differential comparison updates only attributes that have changed. Customizable date range to synchronize, past and future. Frequency of automatic syncs, including push-sync from Outlook. Configurable proxy settings, or use Internet Explorer's. Merge new events into existing on the destination calendar. Prompt on deletion of items. Ability to obfuscate custom words for privacy/security. Option to force items as public or private in target calendar. Syncs recurring items properly as a series.
    Downloads: 5 This Week
    Last Update:
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  • 12
    Zentyal, Linux Small Business Server

    Zentyal, Linux Small Business Server

    Zentyal is a Linux Small Business Server

    Zentyal Server is an easy to use and affordable Linux server, specially designed to meet the needs of small and medium businesses Thanks to Zentyal's Samba integration, Zentyal provides native compatibility with Microsoft Active Directory, allowing you to join Microsoft clients to a domain and manage them easily. Zentyal Server incorporates all the network services required in a small and medium business environment: * Directory & Domain Server with native compatibility with Microsoft Active Directory * Mail Server with ActiveSync and webmail * Gateway with firewall and proxy * Infrastructure Server with DNS/DHCP server, Certification Authority and Virtual Private Networks For more information and download, please access the project's home page.
    Downloads: 22 This Week
    Last Update:
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  • 13
    pickadate

    pickadate

    jQuery date and time input picker

    There’s a tonne of options to customize the date and time pickers, such as month/year selectors, time intervals, etc. There’s also a rich API to extend the functionality of the picker. Some examples are displayed on Codepen. When using the “classic” theme, it is important to have a wrapper div with position, relative around the source input to ensure the picker is sized according to the input element it is bound to. Supports all modern browsers – and IE8+. Specifically, v3 has been tested with Chrome MWA, Firefox MWA, Opera MWA, Safari Mi, Internet Explorer W, Blackberry 6.0+ and Android 3.2+ browsers. Make sure to also include the legacy.js file along for the oldie browsers. pickadate.js is an open source project, shared under an MIT license. All themes are generated using LESS and compiled from the lib/themes-source folder into the lib/themes folder. The translations live in the lib/translations folder. There are currently 43 language translations included.
    Downloads: 3 This Week
    Last Update:
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  • 14
    WebCalendar
    Project has moved to github: https://github.com/craigk5n/webcalendar WebCalendar is a PHP application used to maintain a calendar for a single user or an intranet group of users. It can also be configured as an event calendar.
    Downloads: 15 This Week
    Last Update:
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  • 15
    todoyu
    Features: web2.0 project- & task-management, timetracking, team organizing, resource management, calendar, interface for your clients and lots more! Content: see license.txt (file section).
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    Downloads: 10 This Week
    Last Update:
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  • 16
    Tempus Dominus

    Tempus Dominus

    A date/time picker widget

    Tempus Dominus is the successor to the very popular "eonasdan/bootstrap-datetimepicker". The plugin provide a robust date and time picker designed to integrate into your project. The picker uses the format option to decide what components to show. Set format to LT, LTS or another valid MomentJs format string to display certain components. The picker uses MomentJs to determine the language string. You can use moment-with-locales or you can include whatever local file you need. Start of the week is based on the locale provided. This is defined by moment's locales. If you want to change it, create your own locale file or override. Looking for a template with the datepicker ready to go? Then get check out the templates provided in our website. Bootstrap.js is needed (transition and collapse are required if you're not using the full Bootstrap).
    Downloads: 2 This Week
    Last Update:
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  • 17
    react-big-calendar

    react-big-calendar

    gcal/outlook like calendar component

    An events calendar component built for React and made for modern browsers (read: IE10+) and uses flexbox over the classic tables-ception approach. Styles can be found at: react-big-calendar/lib/css/react-big-calendar.css, and should be included on the page with the calendar component. Also make sure that your calendar's container element has a height, or the calendar won't be visible. Date internationalization and localization is hard and react-big-calendar doesn't even attempt to solve that problem. Instead you can use one of the many excellent solutions already out there, via adapters called "localizers". Big Calendar comes with two localizers for use with Globalize.js or Moment.js. Choose the localizer that best suits your needs, or write your own. Whatever you do, you'll need to set it up before you can use the calendar (you only need to set it up once).
    Downloads: 2 This Week
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  • 18
    BORG is a calendar and task tracking system written in Java. The calendar provides a nice month view, month-print, email reminders, popup reminders and to do list. The task tracker tracks issues through various states.
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    Downloads: 50 This Week
    Last Update:
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  • 19
    iCal4j
    A Java library for reading and writing iCalendar (*.ics) files.
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    Downloads: 8 This Week
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  • 20
    JDavide
    JDavide (per gli amici JD) è un software gratuito per la gestione dello Studio Legale che aiuta l’avvocato nell’espletamento delle operazioni quotidiane. Funzionalità: pratiche, agenda, formulario, atti, parcellazione, rivalutazione, ecc.
    Downloads: 20 This Week
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  • 21
    IGSuite - Integrated Groupware Suite

    IGSuite - Integrated Groupware Suite

    IGSuite is a web-ajax-based Integrated Groupware Suite

    IGSuite is a web-based Integrated Groupware Suite oriented to be a CRM solution. In the Suite you can find: IGWebMail, IGCalendar, IGContacts, IGArchive, IGWiki, IGTodo, IGChat, Projects, IGFax an HylaFax client, IGFileManager, IGMsg and many other.
    Downloads: 12 This Week
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  • 22
    Kimai - Time Tracking Software

    Kimai - Time Tracking Software

    Time-Tracking for companies and teams with up to 250+ users

    Kimai is web based software that tracks work time, and classifies it. It tracks time and prints out a summary of your activities on demand. Yearly, monthly, daily, by customer, by project, by action. FETCH THE LATEST DOWNLOAD FROM GITHUB: https://github.com/kimai/kimai/releases Record expenses and print customizable invoices in different formats. For further information visit: - https://www.kimai.org - https://www.kimai.cloud - https://github.com/kimai/kimai
    Downloads: 6 This Week
    Last Update:
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  • 23
    qOrganizer is a general organizer that includes a calendar with schedule,reminders,journal/notes for every day, to-do list.But provides features useful for students such as:timetable and a booklet for marks and absences.It's designed to be easy to use.
    Downloads: 5 This Week
    Last Update:
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  • 24
    Material Calendar View

    Material Calendar View

    A Material design back port of Android's CalendarView

    A Material design backport of Android's CalendarView. The goal is to have a Material look and feel, rather than 100% parity with the platform's implementation. Material CalendarView 2.0 comes in with a major change into the core of it's API, we transitioned from using java.util.Calendar to java.time.LocalDate. Also that should not impact the public api (we are still using CalendarDay), both Calendar and LocalDate function a little bit differently. One example of that: Months are now indexed from 1 (January) to 12 (December). You can access from the LocalDate from CalendarDay using getDate().
    Downloads: 1 This Week
    Last Update:
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  • 25
    Pendulum

    Pendulum

    Python datetimes made easy

    Pendulum is a Python package to ease datetime's manipulation. It provides classes that are drop-in replacements for the native ones (they inherit from them). Special care has been taken to ensure timezones are handled correctly, and are based on the underlying tzinfo implementation. For example, all comparisons are done in UTC or in the timezone of the datetime being used. There are several different methods available to create a new DateTime instance. datetime() sets the time to 00:00:00 if it's not specified, and the timezone (the tz keyword argument) to UTC. Otherwise it can be a Timezone instance or simply a string timezone value. Pendulum gives access to more attributes and properties than the default datetime class. The __str__ magic method is defined to allow DateTime instances to be printed as a pretty date string when used in a string context. Simple comparison is offered up via the basic operators.
    Downloads: 1 This Week
    Last Update:
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Open Source Calendar Software Guide

Open source calendar software is a type ofprogram which allows users to inputs and manage events, tasks, appointments, and other project information. This type of software provides users with the ability to easily access their data from any computer or device enabled with an internet connection. Open Source Calendar Software is often web-based, giving it the advantage of interface customizations depending on user preference. It also eliminates the need for purchasing licenses for multiple computers as it can be installed and used on all devices that are connected to the network without extra cost.

Open Source Calendar Software typically offers mix aggregation features such as RSS/Atom feeds and iCalendar subscriptions enabling users to view various calendar entries from different sources in one central location . Users can set reminders regarding upcoming events along with recurrence patterns like daily/weekly/monthly etc., allowing them to plan ahead in a more efficient way. Many open source calendars offer additional features like task management tools and shared workspace capabilities allowing members of a team working together on projects to easily update each other about activities related to those projects.

Some popular open source calendar programs include Zimbra, CalDAVdroid, RainLendar2 Lite , Evolution, Funambol SyncML Client, Horde Groupware Webmail Edition, VtigerCRM 6 Project Management Development Editionand Sunbird calendaring toolkit among many others. Apart from these names there exist many open source calendar applications developed by independent contributors who choose to make them available free of charge over the internet through public software repositories like github or SourceForge . Allowing people worldwide exchange knowledge as well as use it while they continue innovating and developing better software packages every day this encourages personal growth within technology field inspiring others involved into making something great too.

What Features Does Open Source Calendar Software Provide?

  • Scheduling: Open source calendar software provides users with the ability to create, view, and schedule events on a daily, weekly, or monthly basis. It allows users to add event information such as start times and end times as well as details about the event like people attending or location.
  • Alerts: The open source calendar software can send email or SMS notifications reminding the user of upcoming events they have scheduled. This feature helps reduce missed meetings and appointments.
  • Sharing: The open source calendering software allows users to easily share their calendars with colleagues or friends so everyone involved in an event or series of meetings is kept in the loop.
  • Customizable Views: The open-source calendar software offers different customizable views that allow for filtering by category/type of appointment, date range, priority level (high/low), etc., giving the user more control over how they view their data.
  • Syncing Across Multiple Devices: With open source calendaring software, users are able to sync their calendars across multiple devices such as computers, tablets, and smartphones so all schedules exist at once in a uniform manner regardless of where one accesses their calendar from.
  • Recurring Events: Open source calendars offer the ability for users set up recurring events that take place on a regular basis such as weekly staff meetings or every other month board meetings. This simplifies maintenance when planning by allowing one to simply add in recurring events just once instead of having to recreate them manually each time they occur again on the calendar schedule.

Types of Open Source Calendar Software

  • CalDAV Based: These are calendar programs that use the CalDAV protocol. This type of open source software allows users to easily access and manage events stored in remote calendars, such as those stored on an internet server or other online location.
  • Web-Based: Open source web-based calendar applications allow the user to manage their schedule and other appointments through a web browser interface, without needing to download any additional software.
  • Server Side Scripting Solutions: Provide database functionality for storing information about events, such as start and end times, venue details, etc. The scripting language is responsible for maintaining this database and responding to requests from clients (i.e., web browsers) with information about upcoming events or past/archived events.
  • Desktop Applications: These desktop applications can be opened directly on the user's computer, allowing them to create and manage multiple calendars within the same application window. Depending on the software used, these may also offer synchronization features with cloud services (such as Google Calendar).
  • Mobile Applications: Open source applications designed specifically for mobile devices provide users with access to their schedule while they are on the go. Many of these mobile applications offer synchronization capabilities with popular cloud services like Google Calendar or iCloud so that changes made in one place will be reflected on all associated devices automatically.

What Are the Advantages Provided by Open Source Calendar Software?

  1. Cost Savings: Open source calendar software does not require any license fees, so users are able to save money on their technology investments.
  2. Flexibility: Because open source calendar software is open-source, users have the ability to customize or add additional features as needed without relying on vendor support.
  3. Security and Reliability: Open source calendar software is developed by a large community of developers who test and review the code before it is released, so it offers better security and reliability than proprietary solutions.
  4. Scalability: Because open source calendar software can accommodate large amounts of data, it makes it easier for businesses to scale their operations with minimal disruption or loss in efficiency.
  5. Improved Collaboration: Many open source calendars feature integrated collaboration capabilities like file sharing and task management which make it easier for teams to work together remotely in real-time.
  6. Support from the Community: Since open source projects are managed by a community of developers, there’s usually plenty of help available when you need advice or assistance with certain features or problems that may arise with your installation.

Types of Users That Use Open Source Calendar Software

  • Small Business Owners: Business owners often prefer open source calendar software because it offers them the flexibility to customize their scheduling needs. It also allows them to easily share calendars with colleagues and customers, as well as manage contact information and tasks.
  • Home Users: Open source calendar software is an ideal solution for home users who need to manage family schedules, pay bills, plan events, or just simply keep track of daily activities. Home users often appreciate the ability to store digital documents along with their personal notes and reminders within their digital calendar.
  • Students: Students can benefit from open source calendar software by taking advantage of its task-management capabilities and keeping track of upcoming assignments and projects. Students also can use these programs to set up reminders for important dates such as exams or due dates for papers.
  • Schedulers/Organizers: Professional schedulers or organizers often utilize open source calendar programs so that they can quickly access multiple calendars at once and make any necessary adjustments with ease. These users typically require the highest level of customization, collaboration features, and mobile accessibility offered by open source calendar programs.
  • Event Planners: Event planners find that using an open source program makes it easier for them to coordinate multiple events at once while managing attendee lists in real time. They also take advantage of other features such as event templates which allow them to replicate similar events quickly and easily.

How Much Does Open Source Calendar Software Cost?

Open source calendar software is typically offered at no cost. Many leading open source projects and programs are available for free, allowing users to take advantage of the many benefits that come with using open source technology without having to pay a dime. Open source calendars often include robust features such as shared events, reminders, task lists, and integration with other services like Google Calendar or Outlook. Additionally, many come with support for multiple languages or mobile access so users can stay organized wherever they go. With no upfront costs required and these powerful features in tow, you can reap the rewards of an open source calendar while saving on operational costs.

What Software Does Open Source Calendar Software Integrate With?

Open source calendar software can integrate with a range of different types of software. These include customer relationship management (CRM) systems, enterprise resource planning (ERP) systems, and other business automation tools. Additionally, it can also be integrated with email client programs such as Outlook or Gmail so that users can share their calendars with others and schedule events from their inboxes. Finally, many open source calendar platforms have plugins which allow them to be linked up to social media networks like Facebook, Twitter and Instagram for easy sharing of events on those platforms.

Trends Related to Open Source Calendar Software

  1. Increased Collaboration: Open source calendar software has enabled users to collaborate on the same calendar, making it easier for teams to share information, schedule meetings, and manage tasks.
  2. Automated Reminders: Many open source calendar programs come with built-in reminders so that users can be reminded of upcoming events and tasks.
  3. Better Security: Open source calendar software offers improved security with encryption and other features that help protect user data.
  4. Improved Usability: Open source calendars are often designed to be more user-friendly than their traditional counterparts, with intuitive designs and easy navigation.
  5. Cloud Synchronization: Many open source calendar programs have the ability to sync with the cloud, allowing users to access their calendars from any device with an internet connection.
  6. Accessibility: Open source calendars are available for a wide range of platforms, including Windows, Mac OS X, iOS, Android, and Linux. This makes them accessible to a wider range of users.
  7. Support for Multiple Languages: Most open source calendar programs support multiple languages so users can use the program in their native language.

How Users Can Get Started With Open Source Calendar Software

Getting started with open source calendar software is fairly straightforward and can be done in a few easy steps.

The first step is to decide which type of open source calendar you want to use. Popular options include Mozilla Thunderbird, Nextcloud Calendar, and Open-Xchange Calendar. All three platforms have free versions available for download on the web. Researching each one's features and capabilities will help you determine which option best suits your needs.

The next step is to register or sign up for the associated platform account after downloading your desired software package. This registration process ensures that all your data remains securely stored within the system.

Once registered, you'll need to set up accessibilty settings so that other users are able to view shared events or send invitations when necessary. Depending on what platform you're using, this may involve assigning permission levels or creating groups based on who has access to certain calendars/events.

The final step is to start creating entries and populating your calendar with important dates related to yourself or others who are part of the same network (family members, colleagues etc). You can share these events publicly or keep them private by marking them as 'private'. Most calendar softwares also come equipped with useful tools such as reminders, tasks lists and notes which help increase personal productivity over time - all of which can be synced across multiple devices for ultimate convenience.