Open Source Python Calendar Software

The Cal.diy project is a fully open-source, self-hosted scheduling platform that provides an alternative to proprietary booking tools while giving users complete control over their infrastructure. It is a community-driven fork of Cal.com that removes all enterprise and commercial features, ensuring that the entire codebase remains MIT-licensed and accessible. The platform enables users to manage bookings, availability, and integrations without relying on external services or subscription models. Built with modern web technologies such as Next.js, React, and PostgreSQL, it offers a robust foundation for building custom scheduling workflows. The system is designed for developers and advanced users who prefer to host and secure their own data rather than depend on third-party providers. It also supports integration with external tools through APIs and authentication systems, allowing flexible customization.

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

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.

Kalibro is an open source free software to manage devices and tools for calibration and maintenance records. It helps you to keep inventory and reminds you the scheduled dates. Kalibro also helps you to satisfy the requirements of the Quality Management Standards like ISO9001, AS9100 and TS16949. Manufacturing, Quality and IT departments of small/medium sized companies are targeted to use Kalibro. You do not need to use spread sheet files to save your critical calibration records. See the Kalibro website (http://www.ozanh.com/kalibro) for further details.

HERO Planner – Unleash Your Scheduling Superpowers Is rostering your kryptonite? Transform chaos into control with HERO Planner, the command center for retail, hospitality, and service teams. This modern desktop app turns managers into scheduling superheroes—no cape required. Your Utility Belt: ✓ Super Speed: Intuitive drag-and-drop & bulk actions for lightning-fast updates. ✓ Compliance Shield: Real-time alerts guard against labour law violations and overtime risks. ✓ X-Ray Vision: Instantly visualize coverage gaps, conflicts, and staff availability. ✓ Universal Export: PDF, CSV, and HTML formats. ✓ Stealth Mode: Sleek Dark Mode & customizable themes. Built on Electron, React & Vite for blazing performance. Whether managing a small squad or a legion of 200+ staff, HERO Planner gives you the tools to save the day. Don't just manage the rota—be the Hero.

TiMo - Time is Money, is a free manager of calculation of hours worked in the month. The characteristics include calculate of hours, minutes and money, generation of report for impression.

A course timetable application for students at the Royal Institute of Technology (KTH) in Sweden. Imports the timetable from TimeEdit and Daisy and shows it graphically. Also exports vCalendar data and HTML.

A Plone, Archetypes based product which provides reminder objects (a new eventlike content type) and a tool for processing reminder objects periodically.

BetaCalendars SheetForge is an MIT-licensed Python toolkit for generating and validating deterministic printable Gregorian calendars. Build month grids and page layouts in SVG, HTML, JSON, or CSV. Configure week starts, natural or six-week grids, adjacent-day policies, and paper sizes; validate date and year-boundary behavior. Source code and release downloads are available in the Files area. Printable calendar references: https://www.betacalendars.com/

A Rainlendar-like calendar for your desktop released under GNU GPL License. It is good looking (using real transparency), small and it integrates well in your desktop.

This is a project for lawyers in India to track their cases that come up for hearing in the Madras High Court in the NIC web site.

Plugins to synchronize Evolution calendar with the online Google calendar and BlackBerry device calendar.

Web based task management software, written with django. Its based on trac/redmine and aims to manage projects, tasks, hours of work, documentation and code of a company or any kind of group.

This is a part of the Ice Coral project. The TimeSpan is focused on event evidence, for example scheduled tasks (Windows Task Scheduler, crond). For more info visit Ice Coral - TimeSpan Web Site.

An applet for avant window navigator for use in x based operating systems spcially Linux under the terms of GNU public license. It shows Iranian calendar (Jalali) and converts Gregorian dates to Jalali. You can even see in which day of week you born!

Agenda collaboratif avec gestion de planning et notes de frais

MyWorkshop will provide a Web service for none profit organizations to manage workshops, publish workshop events on a Web calendar, and manage attendees information and confirmation.

Personal web server which allows to take notes and read them locally or remotely with a browser or a rss-feed client. Each note can be classified into user defined categories and appears in a given date following an advanced time validity sintax.

Originally a reimplementation of OpenGroupware's ZideStore. While compatible with legacy ZideStore Coils provides a sophisticated workflow system with ETL and integration capabilities and superior WebDAV/CalDAV features and compatibility. The workflow engine suppports processes described in BPML and provides integration with a variety of services include SSH, LPD, LDAP, and relation databases.

An Open-source hair/beauty salon management system

Time and project management for personal use.

OrganizerCalendar is a command line utility written in python that will help you organize your upcoming appointments using only command line, so you can use for example ssh to manage your calendar from remote computer.

palm2ics project provides a set of tools (Python converter, HotSync conduit) for Palm desktop (v4.1+) and Palm OS 5 devices (T5, TX, Z21...) synchronization towards iCalendar files (RFC 2445).

A paging system for sending reminders to any email address including cell phone text messages based upon calender entries in Sunbird. Coded entirely in Python

Tamil calendar application computes panchangam for the given Gregorian calendar day such as Tamil month,Tamil year, Tithi , Nakshatra, Raghu Kaalam , Yema Kandam etc.