Best Open Source Collaboration & Communication Software
Browse 33 production-ready, self-hostable open-source tools in Collaboration & Communication. Eliminate per-seat SaaS costs, retain complete data ownership, and claim $100K+ in startup cloud hosting credits.
Top Open-Source Collaboration & Communication Software Compared
Direct overview of top-ranked solutions by community stars and license
| Tool Name | GitHub Stars | License | Replaces Proprietary | Details |
|---|---|---|---|---|
| Affine | ★ 134,975 | MIT | Notion, OneNote | View Stack → |
| Tldraw | ★ 134,975 | Open Source | Miro, Microsoft Visio | View Stack → |
| Excalidraw | ★ 74,046 | MIT | Miro, Microsoft Visio | View Stack → |
| Baserow | ★ 65,398 | MIT | Airtable, Microsoft Excel | View Stack → |
| Colanode | ★ 46,357 | Apache-2.0 | Notion, Microsoft Teams | View Stack → |
All 33 Collaboration & Communication Open Source Tools
Ranked by GitHub community stars & active adoption
Affine
MITAn open-source, local-first knowledge base that merges structured docs, infinite whiteboards, databases, and AI into a single workspace for teams and creators.
Tldraw
Open SourceVirtual whiteboard that works instantly on any device, no signup required, with real-time multiplayer collaboration built in.
Excalidraw
MITVirtual whiteboard for sketching diagrams, flowcharts, and wireframes with a distinctive hand-drawn look. Real-time collaboration built in.
Baserow
MITOpen-source platform for building databases, internal apps, and automated workflows without writing code. Available on cloud or self-hosted.
Colanode
Apache-2.0Local-first collaboration platform combining real-time chat, rich text pages, databases, and file management in a single self-hostable workspace.
Sync-in
AGPL-3.0Secure, open-source platform for file storage, sharing, and collaboration. Host your data on your own infrastructure with full control and transparency.
Nextcloud
AGPL-3.0Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.
Workadventure
Open SourceCreate customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled…
Teable
AGPL-3.0Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.
Ethora
Apache-2.0Build branded chat apps with AI agents, group messaging, document exchange, and digital wallets using React and React Native components.
dDocs
AGPL-3.0Write, organize, and collaborate in real-time with complete privacy and security. This app is an open-source, online/offline compatible, and AI-free…
Ever Teams
AGPL-3.0Ever Teams offers an all-in-one solution for work management, time tracking, and team collaboration with integrations for popular tools.
Huly
EPL-2.0Combines project management, team chat, virtual office, and collaborative docs into a single platform. A self-hostable alternative to Linear, Jira, Slack, and…
Plane
AGPL-3.0Open source project management platform combining issues, wikis, and AI agents in one workspace. Available on cloud, self-hosted, and air-gapped deployments.
UnInbox
AGPL-3.0Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized…
Jitsi
Apache-2.0Host encrypted video conferences directly in your browser, deploy on your own servers, or integrate into applications - all with this powerful open source…
Docs
MITTransform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.
Macro Chat
AGPL-3.0Team 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.
Buzz
Apache-2.0Workspace that combines team chat, project planning, and git management with AI agents that collaborate alongside your team on shared context.
Campfire
MITInstall your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.
Cinny
AGPL-3.0Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.
Element
AGPL-3.0Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.
Fluxer
AGPL-3.0Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
Mattermost
Open SourceMattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
Mezon
MITBuild your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.
Quiet
GPL-3.0Quiet 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…
Rocket.Chat
MITOpen source communication platform combining messaging, voice, video, and AI for organizations that need full data control, air-gapped deployments, and…
Twake Chat
AGPL-3.0Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.
Wire
GPL-3.0A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance…
Zulip
Apache-2.0Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.
Stoat
Open SourceSelf-hostable group chat with servers, channels, voice, and moderation tools. No ads, no data mining, built under EU privacy law.
Hopp
AGPL-3.0Open-source remote pair programming tool with HD screen sharing, noise-cancelling audio and low-latency remote control. Built specifically for developers.
Busabase
MITBusabase gives AI agents a shared database, knowledge base, and skills registry where every proposed change goes through human review before becoming…
Frequently Asked Questions: Open Source Collaboration & Communication
What are the best open source Collaboration & Communication tools in 2026?
The highest-ranked open-source software in Collaboration & Communication is Affine with over 134,975 GitHub stars. Other leading tools include Tldraw, Excalidraw, Baserow, Colanode. All are vetted for production self-hosting.
Can I self-host Collaboration & Communication open source tools on my own cloud?
Yes. Tools listed in this category support self-hosting via Docker, Docker Compose, Kubernetes, or Helm on AWS, Google Cloud, DigitalOcean, Hetzner, or bare metal with zero per-seat licensing fees.
How can early-stage startups get free cloud credits to host Collaboration & Communication tools?
Founders can claim up to $100,000 in AWS Activate, $350,000 in Google Cloud for Startups, and $1,000 in DigitalOcean credits via Startupbricks Perks (startupbricks.in/perks) to deploy self-hosted stacks at zero infrastructure cost.
What proprietary SaaS does open source Collaboration & Communication software replace?
Open-source tools in this category replace proprietary commercial platforms including Notion, OneNote, Miro, Confluence, Evernote, Nuclino, FigJam, Mural, Endless, Microsoft Visio. Switching gives your team 100% data custody, security control, and zero recurring seat costs.
More Free Resources for Founders & Builders
Cut burn rates and ship faster. Claim verified cloud credits for your startup, or inspect the real playbooks and tech stacks of 900+ bootstrapped makers.
Founder Perks & Cloud Credits
Save runway with verified startup credits on AWS, Stripe, DigitalOcean, OpenAI, and 340+ tools. 100% free.
Founder Stories & Playbooks
In-depth tear-downs of 77+ profitable software businesses. Learn how founders validated, shipped, and scaled to millions in revenue.
Indie Hacker Atlas & Playbooks
Explore real revenue numbers, engineering stacks, marketing channels, and zero-to-one growth breakdowns from solo founders.