Calendar & Contacts

Online appointment scheduling system

Beautiful open-source form builder

Command-line calendar built on CalDAV

Replaces Google Calendar

Self-hosted event management and ticketing backend

Replaces Eventbrite, Sched

Open-source calendar and task sync client for Android

Replaces Google Calendar Sync, iCloud sync

Open-source calendar server companion for events

Replaces Google Calendar

Synchronize calendars and contacts via CalDAV/CardDAV

Replaces iCloud sync

End-to-end encrypted sync for contacts and calendars

Replaces Google Calendar, iCloud

Flexible tournament system to build a tournament setup, add teams,

Ticket reservation system

Text-based calendar and scheduling application

Replaces Google Calendar

Self-hosted shared calendar with public event pages

Replaces Calendly, Google Calendar

CalDAV web client with an Ajax interface

Replaces Google Calendar

Resource scheduling and reservation system

Replaces Skedda, Acuity Scheduling

The ultimate tool to interact with your audience (alternative to

POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to

CalDAV task list app for Nextcloud

Replaces Google Tasks, Todoist

File-based calendar and contacts synchronization

Replaces Google Calendar

Presentation and assembly system for managing and projecting agenda,

Manage my Damn Life (MMDL) is a self-hosted front end for managing

Online polling and meeting scheduling tool

Replaces Doodle

Git-backed CalDAV and CardDAV server

Replaces Google Calendar, iCloud

Self-hostable scheduling tool for booking meetings

Replaces Calendly, Doodle

Self-hosted meeting poll and availability finder

Replaces When2meet, Doodle

Standards-compliant calendar and scheduling server

Replaces Google Calendar, Exchange

Manage complex group hierarchies with members, events and a lot more

Community-feedback tool for managing incoming feedback and

Create a simple place for your entire family to use to find gifts that

Local CalDAV bridge for EteSync encrypted accounts

Replaces iCloud Calendar

Conduct polls about dates, times or general questions

Webbased app to book seats, desks and rooms for offices

Simple desktop calendar with CalDAV support

Replaces Google Calendar

Minimal events aggregator

Community-focused event management and ticketing platform

Calendar and scheduling component of KDE Kontact

Replaces Outlook Calendar

Web client for CalDAV and CardDAV servers

Replaces Google Calendar web

Calendar application from the Horde groupware suite

Replaces Google Calendar, Exchange

Create collaborative surveys, quizzes, brainstorms, and word clouds