Best Open Source Collaboration & Communication Tools in 2026

Open-source virtual whiteboard for creating hand-drawn style diagrams and sketches.

Decentralized social network server that federates with the broader Fediverse — run your own instance instead of relying on Twitter/X.

Open-source project management platform — an alternative to Jira, Linear, Monday, and ClickUp.

Open-source scheduling infrastructure — a self-hostable alternative to Calendly for booking meetings and appointments.

The most popular self-hosted cloud platform for file storage, collaboration, and communication.

Open-source video conferencing platform — free, secure, and self-hostable.

Open-source, self-hosted project management tool — a free alternative to Trello, Notion, and Asana.

Modern, lightweight self-hosted music server compatible with Subsonic/Airsonic clients — stream your music everywhere.

Open-source kanban board built with Meteor — a free and self-hosted alternative to Trello.

Open-source real-time collaborative text editor you can self-host.

Open-source project management software — an alternative to Jira, Asana, Trello, and Monday.com.

Federated, decentralized video hosting platform built on ActivityPub.

Federated link aggregator and community discussion platform — a decentralized, self-hostable alternative to Reddit.

Open-source survey and experience management platform for product and customer research.

Self-hosted live video streaming server with built-in chat and Fediverse integration.

Open-source virtual classroom platform built for online education and webinars.

End-to-end encrypted collaborative office suite with zero-knowledge privacy.

Self-hosted office suite with real-time collaboration.

Open-source LibreOffice-powered collaborative office suite for self-hosted environments.

End-to-end encrypted group video calling built on the Matrix open protocol.

Straightforward realtime kanban boards for intuitive task tracking with dark mode and collaborative features.

A beautiful terminal email client built with Go and Bubble Tea. An open source alternative to Superhuman and Outlook for the command line.