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Open Source Collaboration & Communication Tools

A curated collection of the best open source tools facilitating team communication and collaboration.

See also:Team Chat & MessagingVideo Conferencing & Virtual OfficeCollaborative Workspaces
Favicon of Baserow

Baserow

No-code database and app builder you can self-host

  • Stars

    5,645

  • Last commit

    14 hours ago

  • License

    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:

Favicon of Airtable
Airtable
Favicon of Macro Chat

Macro Chat

Team chat with email, tasks, and docs in one workspace

  • Stars

    3,884

  • Last commit

    5 hours ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Excalidraw

Excalidraw

Collaborative whiteboard with a hand-drawn aesthetic

  • Stars

    130,125

  • Last commit

    5 days ago

  • License

    MIT
Virtual whiteboard for sketching diagrams, flowcharts, and wireframes with a distinctive hand-drawn look. Real-time collaboration built in.

Open Source Alternative to:

Favicon of Miro
Miro
Favicon of Affine

Affine

Docs, whiteboards, and databases in one privacy-first workspace

  • Stars

    71,717

  • Last commit

    3 hours ago

  • License

    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:

Favicon of Notion
Notion
Favicon of Plane

Plane

Project management for teams and AI agents

  • Stars

    56,610

  • Last commit

    20 hours ago

  • License

    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:

Favicon of Linear
Linear
Favicon of Tldraw

Tldraw

Free instant whiteboard with real-time collaboration

  • Stars

    49,883

  • Last commit

    15 hours ago

  • License

    Unknown
Virtual whiteboard that works instantly on any device, no signup required, with real-time multiplayer collaboration built in.

Open Source Alternative to:

Favicon of Miro
Miro
Favicon of Rocket.Chat

Rocket.Chat

Self-hosted team messaging with voice, video, and AI

  • Stars

    46,012

  • Last commit

    7 hours ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Buzz

Buzz

Team chat, project management, and AI agents in one place

  • Stars

    28,963

  • Last commit

    3 hours ago

  • License

    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:

Favicon of Slack
Slack
Favicon of Mattermost

Mattermost

Secure collaboration platform for mission-critical work

  • Stars

    38,856

  • Last commit

    4 hours ago

  • License

    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:

Favicon of Slack
Slack
Favicon of Nextcloud

Nextcloud

Secure cloud collaboration platform for organizations

  • Stars

    36,505

  • Last commit

    6 hours ago

  • License

    AGPL-3.0
Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.

Open Source Alternative to:

Favicon of Google Drive
Google Drive
Favicon of Jitsi

Jitsi

Private, secure video calls with no account needed

  • Stars

    29,779

  • Last commit

    9 hours ago

  • License

    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:

Favicon of Microsoft Teams
Microsoft Teams
Favicon of Zulip

Zulip

Organized team chat for distributed teams

  • Stars

    25,742

  • Last commit

    3 hours ago

  • License

    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:

Favicon of Slack
Slack
Favicon of Huly

Huly

All-in-one workspace for project, chat, and docs

  • Stars

    27,406

  • Last commit

    10 days ago

  • License

    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:

Favicon of Notion
Notion
Favicon of Teable

Teable

Flexible database meets intuitive spreadsheet interface

  • Stars

    21,682

  • Last commit

    4 hours ago

  • License

    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:

Favicon of Airtable
Airtable
Favicon of Docs

Docs

Create, edit and share documents with real-time collaboration

  • Stars

    16,743

  • Last commit

    17 hours ago

  • License

    MIT
Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Fluxer

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,058

  • Last commit

    13 hours ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Element

Element

Secure, decentralized messaging for teams and individuals

  • Stars

    13,394

  • Last commit

    10 hours ago

  • License

    AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Favicon of Discord
Discord
Favicon of Workadventure

Workadventure

Virtual office platform for engaging remote collaboration

  • Stars

    5,721

  • Last commit

    17 hours ago

  • License

    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:

Favicon of Microsoft Teams
Microsoft Teams
Favicon of Campfire

Campfire

Self-hosted group chat without recurring subscription fees

  • Stars

    4,500

  • Last commit

    23 hours ago

  • License

    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:

Favicon of Slack
Slack
Favicon of Colanode

Colanode

Self-hosted team workspace with chat, docs, and databases

  • Stars

    5,021

  • Last commit

    5 months ago

  • License

    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:

Favicon of Notion
Notion
Favicon of Cinny

Cinny

Secure and elegant Matrix client for seamless conversations

  • Stars

    3,853

  • Last commit

    7 days ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Stoat

Stoat

Group chat for friends and communities, without the baggage

  • Stars

    3,239

  • Last commit

    13 hours ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Quiet

Quiet

Serverless team chat over Tor, no phone number needed

  • Stars

    2,638

  • Last commit

    2 days ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Sync-in

Sync-in

Open-source file storage with complete data sovereignty

  • Stars

    1,642

  • Last commit

    14 days ago

  • License

    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:

Favicon of Google Drive
Google Drive
Favicon of Wire

Wire

Secure collaboration platform with end-to-end encryption

  • Stars

    2,543

  • Last commit

    8 months ago

  • License

    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:

Favicon of Discord
Discord
Favicon of Mezon

Mezon

Create custom spaces to chat, game, and connect globally

  • Stars

    1,570

  • Last commit

    3 hours ago

  • License

    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:

Favicon of Discord
Discord
Favicon of UnInbox

UnInbox

Transform team email into efficient collaborative workflows

  • Stars

    1,754

  • Last commit

    6 months ago

  • License

    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:

Favicon of Gmail
Gmail
Favicon of Ethora

Ethora

Messaging SDK with AI agents for web, iOS, and Android

  • Stars

    542

  • Last commit

    1 day ago

  • License

    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:

Favicon of Stream
Stream
Favicon of Ever Teams

Ever Teams

Real-time work and project management platform

  • Stars

    544

  • Last commit

    2 days ago

  • License

    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:

Favicon of Linear
Linear
Favicon of dDocs

dDocs

End-to-end encrypted collaborative document editor

  • Stars

    392

  • Last commit

    5 hours ago

  • License

    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:

Favicon of Microsoft Word
Microsoft Word
Favicon of Twake Chat

Twake Chat

Secure open source messaging for professional teams

  • Stars

    163

  • Last commit

    4 hours ago

  • License

    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:

Favicon of Slack
Slack
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