Best Multi-User Calendar & Contacts for self-hosting

Online appointment scheduling system

Beautiful open-source form builder

Self-hosted event management and ticketing backend

Replaces Eventbrite, Sched

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

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

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

Self-hostable scheduling tool for booking meetings

Replaces Calendly, 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

Conduct polls about dates, times or general questions

Webbased app to book seats, desks and rooms for offices

Minimal events aggregator

Community-focused event management and ticketing platform

Calendar application from the Horde groupware suite

Replaces Google Calendar, Exchange

Create collaborative surveys, quizzes, brainstorms, and word clouds