Replace your Calendar. 80 alternatives. 80 open source, 0 closed.

Todo.txt manager. Offline, works with Syncthing. Fork of SimpleTask Cloudless

Private offline calendar: encrypted, zero network, encrypted backups.

A simple but robust task manager available on Android, Windows and Linux.

Replace your email, messenger, and calendar with one app.

A simple yet useful birthday manager. Birday is free and ad-free! 🥳

See birthdays and other events from your contacts in your calendar.

Creates birthday events from all other calendar's data

An App counting down to your next birthday!

This application will help you remember all the birthdays of your friends

Create and send Appointment-Confirmation-Message from Android-Calendar-Entry.

Change the calendar color

Import, Export & Backup your calendars using ics files

A Material 3 Expressive calendar for Android with no network access.

Sync local calendars offline. Free, open source, no account needed.

Sync notification time info to calendar automatically

Add smart functions to your Casio square BT G-Shock Watch.

Clock + Calendar combo widget for Android

Concert Diary recreates a personal diary for concerts and festivals.

Your Personal Assistant for Every Special Occasion.

Simple ofline date calculator with reminder.

Find the German public holidays per state and year

An app to manage and track medication doses

Etar is a material designed open source calendar, for everyone!

Secure, private and end-to-end encrypted calendar, contacts and tasks sync

Looking for a prof's or friend's school timetable? Look in here!

Stay organized. Stay focused. Stay in Flux.

Securely plan, schedule, and set reminders with our private calendar app.

French Revolutionary calendar widget

Schedule viewer for conferences and other events

Offline academic tracker: GPA, CGPA, timetable, and scholarship deadlines

A native Org-mode notes app for Android. Your notes stay plain .org files.

Hebrew date, holidays, zmanim and Omer count on your lockscreen

Biblical feast days, sabbaths, and moon phases on a lunar calendar

Public and Regional Holidays for 100+ Countries

Offline-compatible browser for cultural events in Leipzig

Subscribe to Webcal (.ics) calendars

Gregorian and Persian (Jalali) calendar with a two-way date converter

Keep track of journals, notes & tasks - iCalendar compliant and syncable with yo

Your tasks in the right order, fitted into your day. No account, no network.

All your calendars in one app. iCloud, CalDAV, device, ICS. Private.

Access your replacements with style

Surprise friends with notifications

Feature rich event, group and time management system

Wake up with light! This alarm can only be turned off when your room is bright

The only fully-functional open-source calendar app with Material You.

Minimal Calendar Widget

A private, fully-offline productivity app for focusing on what matters

Synchronization client

Synchronization client

Import Facebook-Events to the calendar

A simple notepad and to-do app with an excellent navigation

Live your life in Org Mode? Take it with you on your Android device.

Outliner for taking notes and managing to-do lists in Org-mode format

A menstrual calender with calculation of fertile days according to Knaus-Ogino.

Android Persian Calendar

App used to track, manage and remind you of your own stuff.

Todo, agenda, journal and notes in plain Markdown files

colorful, text-based calendar widget

Goals, checklists, tasks, repetitive tasks, calendar and 24/7 time tracking.

Offline rota and shift viewer with today/tomorrow focus, widget, zero tracking.

One phrase — and it's on your calendar. No forms, no fields.

A smart shift calendar

End-to-end encrypted sync for calendar, contacts, and tasks

Count your days together. Private, ad-free and made for every kind of love.

Free, private, all-in-one personal organizer. Self-hostable.

Fixed and random reminder scheduler.

Access to the Online Portal for Students at the University of Passau

A calendar provider add-on for Suntimes.

Tasks, notes and calendar over CalDAV — or local-only on your phone.

Amazigh Calendar

Latin date generator with a widget

A date and calendaring tool for Android

Home screen widgets displaying events from selected calendars and task lists

Quantum-safe encrypted planner to schedule & manage your events & sync calendars

Keep an eye on the days remaining before the new release of Ubuntu!

See when you’re free — Vacation Days helps you keep track of your days off.

A mix between a calendar and a clock that makes you wait faster.

Vedroid Events - simple birthdays and events remainder app without any stupid us

A clean function-based intuitive note-taking app with Material You design.

Tibetan and Japanese calendars with almanac readings, and a meditation timer