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.

  • Hybrid IT Automation Software and Solutions | Stonebranch Icon
    Hybrid IT Automation Software and Solutions | Stonebranch

    The Stonebranch Universal Automation Center is designed to help organizations automate, manage, and orchestrate their IT processes.

    Enterprise job scheduling software helps automate IT task as part of a daily system plan. This SaaS-based or on-premises solution initiates business processes and tasks at regular intervals. Learn what characteristics make it unique.
  • Go beyond a virtual data room with Datasite Diligence Icon
    Go beyond a virtual data room with Datasite Diligence

    Datasite Diligence, helps dealmakers in more than 170 countries close more deals, faster.

    The data room with a view. Evolved for next-generation M&A. Built on decades of deal experience. Packed with expert tools, yet intuitive for novices. A fully mobile platform with frictionless processes. Smart AI tools that let you close more deals, faster, plus end-to-end support at all times. Do due diligence with intelligence.
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    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: 1,096 This Week
    Last Update:
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  • 2
    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: 177 This Week
    Last Update:
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  • 3
    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: 48 This Week
    Last Update:
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  • 4
    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.
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    Downloads: 13 This Week
    Last Update:
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  • The CalAmp Telematics Cloud is a dependable secure platform that is the solid foundation for your telematics needs. Icon
    Optimize Your Fleet Management. Track All Your Assets. Seamlessly Leverage IoT Data Into Your Processes.
  • 5
    openCRX - Enterprise Class CRM

    openCRX - Enterprise Class CRM

    professional CRM and groupware service, ready for the cloud

    openCRX moved to https://github.com/opencrx
    Downloads: 13 This Week
    Last Update:
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  • 6
    Kimai - Time Tracking Software

    Kimai - Time Tracking Software

    Time Tracker solution for freelancers and teams

    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. Record expenses and print customizable invoices in different formats. For further information visit: - https://www.kimai.org - https://www.kimai.cloud - https://github.com/kevinpapst/kimai2
    Downloads: 13 This Week
    Last Update:
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  • 7
    Lifeograph

    Lifeograph

    private digital diary & note taking appliaciton

    Lifeograph is a diary program to take personal notes on life. It has all essential functionality expected in a diary program and strives to have a clean and streamlined user interface.
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    Downloads: 22 This Week
    Last Update:
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  • 8
    Calizo is a calendar with a zoomable timeline. Unlimited zooming allows to manage historic, genealogical, biographic data, everyday tasks, projects or life plans - for scheduling, genealogy, project management, todo lists, link- and file- organizatio
    Downloads: 8 This Week
    Last Update:
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  • 9
    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.
    Downloads: 22 This Week
    Last Update:
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  • Sell your products and services as gift cards, vouchers and tickets with powerful automation Icon
    Vouchers, gift cards and tickets are the most profitable items your business can sell today. On average, only 85% of business vouchers are redeemed. Since VoucherCart delivers payment in full and in advance, your business can sell confidently, safely, and without hassle.
  • 10
    A simple agenda tool written in PHP with MySQL backend. An agenda tool accessible everywere there's internet. Easy to install and configure. Key-features include: scheduling appointments, holidays, todo lists, secure access, multiple users, etc.
    Downloads: 5 This Week
    Last Update:
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  • 11
    time management made easy - timeEdition is targeted at all users in a computer workplace who value detailed documentation of their working hours, whether they use it for customer billing or for monitoring the duration of individual projects.
    Downloads: 5 This Week
    Last Update:
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  • 12
    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: 2 This Week
    Last Update:
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  • 13
    BRIM is a MVC framework, written in PHP and based on items with a hierarchical relationship. The list of plugins make BRIM a Information Manager with plugins like bookmarks, a calendar, contacts tasks, notes, RSS etc. The application is multilingual.
    Downloads: 6 This Week
    Last Update:
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  • 14
    Calendar Multiplatform in .NET
    Downloads: 10 This Week
    Last Update:
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  • 15
    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: 5 This Week
    Last Update:
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  • 16
    A calendar widget for Nokia N97, N97 mini, C6 and N8 that behaves like the "today view" from MS Outlook to provide a quick overview of the next upcoming events. On homescreen it shows 4 lines and if there are more events then it will be scrolling.
    Downloads: 3 This Week
    Last Update:
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  • 17
    ComingNext

    ComingNext

    ComingNext is a calendar homescreen widget for the Symbian smartphones

    ComingNext is a calendar homescreen widget for the Symbian S60v5, Symbian^3, Symbian Anna and Symbian Belle smartphones. It sports a triple panel mode where each panel can display 4 upcoming events directly on your homescreen. The widget can easily be customized to your needs.
    Downloads: 1 This Week
    Last Update:
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  • 18
    RemoteCalendars is a COM-.NET Add-in for Outlook 2003/2007, written in C#. After installing this plugin, every Outlook user should be able to subscribe, reload and delete a generic remote iCalendar (RFC 2445) from Outlook 2003/2007.
    Downloads: 1 This Week
    Last Update:
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  • 19
    WeekToDo

    WeekToDo

    WeekToDo is a Free and Open Source Minimalist Weekly Planner and To Do

    WeekToDo is a free and Open Source Minimalist Weekly Planner and To Do list App for simple and effective people. Schedule your tasks, set reminders and handle projects with To Do list and a calendar. Available for Windows, Mac, Linux or online.
    Downloads: 5 This Week
    Last Update:
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  • 20
    sReminder is a small and simple tool that notifies the user of upcoming events, such as birthdays, anniversaries, appointments and so on. It runs under both Linux and Windows.
    Downloads: 4 This Week
    Last Update:
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  • 21
    Agender
    With Agender you can associate notes with some date or with no date in particular, you simply start it and it will create a task-bar icon and stay in the background, without annoying you, it can run on login. Visit the website to see more.
    Downloads: 2 This Week
    Last Update:
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  • 22
    IlohaMail is a PHP based lightweight full featured multilingual webmail program with IMAP and POP3 support. IlohaMail also includes a full-featured contacts manager, bookmarks manager, and scheduler.
    Downloads: 3 This Week
    Last Update:
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  • 23
    HolyServices

    HolyServices

    Planning calendar for holy services

    A planning calendar for scheduling holy services at small parishes. Synchronizes with GoogleCalendar so as to be able to collaborate with mobile devices.
    Downloads: 2 This Week
    Last Update:
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  • 24

    Birthday reminder

    Tool to remind you to upcoming birthdays and events.

    Downloads: 1 This Week
    Last Update:
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  • 25

    PHPAdvocat

    lawyer office suite

    PHPAdvocat (Anwaltskanzlei-Suite) is a web based office suite for lawyer offices to manage contacts, files/documents, invoices and events. It is written in PHP and stores data in a PostgreSQL or MySQL database. Though it is mainly designed for german offices it should be adoptable for other countries. The Development has been moved to Gitlab: https://gitlab.com/phpadvocat/phpadvocat
    Downloads: 1 This Week
    Last Update:
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