Best Open Source Collaboration & Communication Tools in 2026
Tools for team collaboration, project communication, and file sharing across remote and hybrid teams.
16 open source collaboration & communication tools — ranked by GitHub stars. Browse all
Mastodon
Decentralized social network server that federates with the broader Fediverse — run your own instance instead of relying on Twitter/X.
Jellyfin
Free and open-source media server for movies, TV shows, music, and photos — a fully self-hosted alternative to Plex.
Cal.com
Open-source scheduling infrastructure — a self-hostable alternative to Calendly for booking meetings and appointments.
Nextcloud
The most popular self-hosted cloud platform for file storage, collaboration, and communication.
Jitsi Meet
Open-source video conferencing platform — free, secure, and self-hostable.
Google Meet
Navidrome
Modern, lightweight self-hosted music server compatible with Subsonic/Airsonic clients — stream your music everywhere.
Etherpad
Open-source real-time collaborative text editor you can self-host.
Google Docs
PeerTube
Federated, decentralized video hosting platform built on ActivityPub.
YouTube
Lemmy
Federated link aggregator and community discussion platform — a decentralized, self-hostable alternative to Reddit.
Formbricks
Open-source survey and experience management platform for product and customer research.
Google Forms
Owncast
Self-hosted live video streaming server with built-in chat and Fediverse integration.
YouTube
BigBlueButton
Open-source virtual classroom platform built for online education and webinars.
Google Meet
CryptPad
End-to-end encrypted collaborative office suite with zero-knowledge privacy.
Google Docs
ONLYOFFICE
Self-hosted office suite with real-time collaboration.
Google Docs
Collabora Online
Open-source LibreOffice-powered collaborative office suite for self-hosted environments.
Google Docs
Element Call
End-to-end encrypted group video calling built on the Matrix open protocol.
Google Meet