Open Source Scheduling and Calendar Apps for Android

Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.

Organize events with encrypted privacy, zero-knowledge and no tracking. Features include multi-device sync, multiple views, and offline support.

DAVx5 is a CalDAV/CardDAV management and sync app for Android.

Material design open source calendar for Android.

🎉 A beautiful Kotlin app to remember birthdays and events without having to open Facebook, set alarms or rely on Google Calendar.

Privacy-friendly Swiss email solution with 20 GB free storage, custom domain options, contact and calendar sync, and cross-device access in a secure suite.

Right Calendar app is a versatile scheduling tool that offers unparalleled flexibility to its users. One of its standout features is that it is built on an open-source platform. This not only ensures transparency but also allows for constant updates and bug fixes from a...

All-in-one Open-Source productivity app and AI assistant with Tasks, Notes, Calendar, Diary and Bookmarks.

fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!

An alternative mobile client for Untis Timetable, adding features such as filtering out certain classes.

Feature rich event, group and time managment system.

BetterUntis is a features rich Untis Client for Android which has a modern and intuitive user interface.

Tabby is a simple, beautiful timetable application to track your school schedule. You can add tasks, change theme with available dark mode and choose language (english, hungarian, german, spanish).

grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.

Free and open-source Persian Calendar with Compass/Qibla and Athan, and Afghanistan holidays, Dari, Kurdish, Arabic and Pashto support. Supports Gregorian and Islamic calendars support also.

Power Planner is the ultimate homework planner for students, featuring online sync with iOS and Android apps, grade calculation, live tiles, automatic reminders, and more.

GRUP is an event scheduling app that allows you to create recurring events, invite friends, and keep track of their RSVPs.

This app would replace default calendar event notifications, providing snooze functionality and notifications persistence. Reboot is handled, all notifications are restored after reboot.

jquery-calendar - A responsive jquery calendar scheduler built with bootstrap and moment.js

Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.