Top Open Source Collaboration & Communication Tools in 2026
A curated collection of the 28 best free and open-source Collaboration & Communication tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.
Zulip
Organized team chat for distributed teams
Stars25,775Last commit11d agoLicenseApache-2.0
Tldraw
Free instant collaborative whiteboard for all devices
Stars49,987Last commit10d agoLicenseOpen Source
Workadventure
Immersive 2D virtual office & event platform
Stars5,734Last commit11d agoLicenseOpen SourceTemporal
Open source durable execution platform for resilient apps
Stars22,559Last commit11d agoLicenseMIT
Tailscale
Zero-config VPN for secure remote access
Stars35,633Last commit10d agoLicenseBSD-3-Clause
Scanopy
Self-updating network diagrams for infrastructure
Stars5,575Last commit11d agoLicenseAGPL-3.0
Rocket.Chat
Secure team chat with voice, video & AI
Stars46,033Last commit11d agoLicenseOpen Source
Puter
All-in-one cloud desktop for work and play
Stars43,275Last commit10d agoLicenseAGPL-3.0
Campfire
Self-hosted Slack alternative with code access
Stars4,528Last commit13d agoLicenseMITOnlook
Visual code editor for designers in their codebase
Stars26,566Last commit1mo agoLicenseApache-2.0Ntfy
Send push notifications via simple HTTP requests
Stars33,788Last commit17d agoLicenseApache-2.0Mezon
All-in-one community platform with AI agents
Stars1,650Last commit12d agoLicenseOpen Source
Mattermost
Secure collaboration platform for mission-critical teams
Stars38,913Last commit10d agoLicenseOpen Source
Macro Chat
Team chat with AI agents and unified workspace
Stars4,064Last commit11d agoLicenseAGPL-3.0BookWyrm
Decentralized social network for book lovers
Stars2,773Last commit15d agoLicenseOpen Source
