Open source Collaboration & Communication tools
30 free, open source options sorted by GitHub stars.
Free alternatives to Zoom
ExcalidrawCollaborative whiteboard with a hand-drawn aestheticAffineDocs, whiteboards, and databases in one privacy-first workspacePlaneProject management for teams and AI agentsTldrawFree instant whiteboard with real-time collaborationRocket.ChatSelf-hosted team messaging with voice, video, and AIMattermostSecure collaboration platform for mission-critical workNextcloudSecure cloud collaboration platform for organizationsBuzzTeam chat, project management, and AI agents in one placeJitsiPrivate, secure video calls with no account neededHulyAll-in-one workspace for project, chat, and docsZulipOrganized team chat for distributed teamsTeableFlexible database meets intuitive spreadsheet interfaceDocsCreate, edit and share documents with real-time collaborationElementSecure, decentralized messaging for teams and individualsFluxerOpen source messaging with privacy and community focusWorkadventureVirtual office platform for engaging remote collaborationColanodeSelf-hosted team workspace with chat, docs, and databasesCampfireSelf-hosted group chat without recurring subscription feesCinnySecure and elegant Matrix client for seamless conversationsStoatGroup chat for friends and communities, without the baggageQuietServerless team chat over Tor, no phone number neededWireSecure collaboration platform with end-to-end encryptionMezonCreate custom spaces to chat, game, and connect globallySync-inOpen-source file storage with complete data sovereigntyUnInboxTransform team email into efficient collaborative workflowsEver TeamsReal-time work and project management platformEthoraMessaging SDK with AI agents for web, iOS, and AndroidBusabaseA verified workspace where AI agents store and build knowledgedDocsEnd-to-end encrypted collaborative document editorTwake ChatSecure open source messaging for professional teams