Open Source Collaboration & Communication Tools
A curated collection of the best open source tools facilitating team communication and collaboration..
Team chat with email, tasks, and docs in one workspace
Stars
Stars growing over the last 30 days4,799Last commit
1 hour agoLicense
AGPL-3.0
Team chat app with inline threads, mention-based sharing, a unified inbox for chat and email, and an AI agent that works across your full workspace.
Open Source Alternative to:
No-code database and app builder you can self-host
Stars
Stars growing over the last 30 days6,185Last commit
1 hour agoLicense
MIT
Open-source platform for building databases, internal apps, and automated workflows without writing code. Available on cloud or self-hosted.
Open Source Alternative to:
Collaborative whiteboard with a hand-drawn aesthetic
Stars
134,327Last commit
4 hours agoLicense
MIT
Virtual whiteboard for sketching diagrams, flowcharts, and wireframes with a distinctive hand-drawn look. Real-time collaboration built in.
Open Source Alternative to:
Docs, whiteboards, and databases in one privacy-first workspace
Stars
73,731Last commit
9 days agoLicense
MIT
An open-source, local-first knowledge base that merges structured docs, infinite whiteboards, databases, and AI into a single workspace for teams and creators.
Open Source Alternative to:
Project management for teams and AI agents
Stars
61,249Last commit
3 hours agoLicense
AGPL-3.0
Open source project management platform combining issues, wikis, and AI agents in one workspace. Available on cloud, self-hosted, and air-gapped deployments.
Open Source Alternative to:
Team chat, project management, and AI agents in one place
Stars
Stars growing over the last 30 days36,220Last commit
1 hour agoLicense
Apache-2.0
Workspace that combines team chat, project planning, and git management with AI agents that collaborate alongside your team on shared context.
Open Source Alternative to:
Free instant whiteboard with real-time collaboration
Stars
51,027Last commit
4 hours agoLicense
Unknown
Virtual whiteboard that works instantly on any device, no signup required, with real-time multiplayer collaboration built in.
Open Source Alternative to:
Self-hosted team messaging with voice, video, and AI
Stars
46,304Last commit
1 hour agoLicense
MIT
Open source communication platform combining messaging, voice, video, and AI for organizations that need full data control, air-gapped deployments, and zero-trust security.
Open Source Alternative to:
Secure collaboration platform for mission-critical work
Stars
39,400Last commit
2 hours agoLicense
Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
Open Source Alternative to:
Secure cloud collaboration platform for organizations
Stars
37,206Last commit
4 hours agoLicense
AGPL-3.0
Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.
Open Source Alternative to:
Organized team chat for distributed teams
Stars
26,086Last commit
1 hour agoLicense
Apache-2.0
Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.
Open Source Alternative to:
Private, secure video calls with no account needed
Stars
30,116Last commit
4 hours agoLicense
Apache-2.0
Host encrypted video conferences directly in your browser, deploy on your own servers, or integrate into applications - all with this powerful open source platform.
Open Source Alternative to:
All-in-one workspace for project, chat, and docs
Stars
27,956Last commit
3 days agoLicense
EPL-2.0
Combines project management, team chat, virtual office, and collaborative docs into a single platform. A self-hostable alternative to Linear, Jira, Slack, and Notion.
Open Source Alternative to:
Flexible database meets intuitive spreadsheet interface
Stars
21,911Last commit
5 hours agoLicense
AGPL-3.0
Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.
Open Source Alternative to:
Create, edit and share documents with real-time collaboration
Stars
16,937Last commit
5 hours agoLicense
MIT
Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.
Open Source Alternative to:
Open source messaging with privacy and community focus
Stars
10,629Last commit
5 hours agoLicense
AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
Open Source Alternative to:
Secure, decentralized messaging for teams and individuals
Stars
13,604Last commit
4 hours agoLicense
AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.
Open Source Alternative to:
Virtual office platform for engaging remote collaboration
Stars
5,874Last commit
3 hours agoLicense
Unknown
Create customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled meetings.
Open Source Alternative to:
Self-hosted group chat without recurring subscription fees
Stars
Stars growing over the last 30 days4,797Last commit
9 hours agoLicense
MIT
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.
Open Source Alternative to:
Self-hosted team workspace with chat, docs, and databases
Stars
5,170Last commit
7 months agoLicense
Apache-2.0
Local-first collaboration platform combining real-time chat, rich text pages, databases, and file management in a single self-hostable workspace.
Open Source Alternative to:
Secure and elegant Matrix client for seamless conversations
Stars
3,942Last commit
21 hours agoLicense
AGPL-3.0
Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.
Open Source Alternative to:
Group chat for friends and communities, without the baggage
Stars
3,417Last commit
2 hours agoLicense
Unknown
Self-hostable group chat with servers, channels, voice, and moderation tools. No ads, no data mining, built under EU privacy law.
Open Source Alternative to:
Serverless team chat over Tor, no phone number needed
Stars
2,659Last commit
2 days agoLicense
GPL-3.0
Quiet is a peer-to-peer messaging app that syncs messages directly between devices over Tor, with no central server, no phone number required, and no metadata leaks.
Open Source Alternative to:
Open-source file storage with complete data sovereignty
Stars
Stars growing over the last 30 days1,943Last commit
2 days agoLicense
AGPL-3.0
Secure, open-source platform for file storage, sharing, and collaboration. Host your data on your own infrastructure with full control and transparency.
Open Source Alternative to:
Create custom spaces to chat, game, and connect globally
Stars
Stars growing quickly over the last 30 days2,002Last commit
4 hours agoLicense
MIT
Build your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.
Open Source Alternative to:
Secure collaboration platform with end-to-end encryption
Stars
2,555Last commit
10 months agoLicense
GPL-3.0
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.
Open Source Alternative to:
Transform team email into efficient collaborative workflows
Stars
1,760Last commit
8 months agoLicense
AGPL-3.0
Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.
Open Source Alternative to:
A verified workspace where AI agents store and build knowledge
Stars
Stars growing quickly over the last 30 days566Last commit
14 hours agoLicense
MIT
Busabase gives AI agents a shared database, knowledge base, and skills registry where every proposed change goes through human review before becoming canonical data.
Open Source Alternative to:
Messaging SDK with AI agents for web, iOS, and Android
Stars
551Last commit
10 hours agoLicense
Apache-2.0
Build branded chat apps with AI agents, group messaging, document exchange, and digital wallets using React and React Native components.
Open Source Alternative to:
Real-time work and project management platform
Stars
591Last commit
11 hours agoLicense
AGPL-3.0
Ever Teams offers an all-in-one solution for work management, time tracking, and team collaboration with integrations for popular tools.
Open Source Alternative to:
End-to-end encrypted collaborative document editor
Stars
Stars growing over the last 30 days448Last commit
9 hours agoLicense
AGPL-3.0
Write, organize, and collaborate in real-time with complete privacy and security. This app is an open-source, online/offline compatible, and AI-free alternative to Google Docs.
Open Source Alternative to:
Secure open source messaging for professional teams
Stars
Stars growing over the last 30 days171Last commit
5 hours agoLicense
AGPL-3.0
Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.
Open Source Alternative to:
Postiz – The All-in-One agentic social media scheduling tool
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