25 open-source Collaboration vendors.

Open-source software for Collaboration that you can self-host, with auditable source code — regardless of the developer's headquarters.

• BigBlueButton (self-host)Self-hosted / open source

  Virtual classroom and video conferencing; self-hostable

  European Union (distributed)

• CryptPadEU sovereign

  End-to-end encrypted collaboration (FR/EU).

  France

• Element (Matrix)Non-EU vendor

  Decentralised messaging based on the open Matrix protocol

  United Kingdom

• FluffyChatSelf-hosted / open source

  Open-source Matrix chat client with focus on simplicity and privacy

  Germany

• HedgeDocSelf-hosted / open source

  Markdown collaboration; self-host.

  Germany

• HulySelf-hosted / open source

  Open-source project management and team collaboration platform (self-hosted only — vendor-hosted cloud service shut down in 2026 due to funding; huly.io hosted service discontinued)

  France

• HumHubEU sovereign

  German open-source social intranet and collaboration platform

  Germany

• JitsiNon-EU vendor

  Open-source video conferencing platform, self-hostable

  United States

• LinphoneSelf-hosted / open source

  Open-source VoIP and real-time communications platform (voice, video, encrypted messaging) developed by Belledonne Communications, headquartered in Grenoble, France since 2010; actively maintained (SDK 5.5).

  France

• LiveKitNon-EU vendor

  Open-source WebRTC infrastructure for real-time audio and video applications

  United Kingdom

• Matrix / SynapseNon-EU vendor

  Matrix homeserver; self-hostable.

  United Kingdom

• MattermostNon-EU vendor

  Open-source messaging platform for developer and DevOps teams

  United States

• NextcloudEU sovereign

  Open-source self-hosted collaboration platform for file sync, chat, and office

  Germany

• Nextcloud DeckSelf-hosted / open source

  Kanban board app for project management within Nextcloud

  Germany

• Nextcloud TalkSelf-hosted / open source

  Video/voice within Nextcloud; self-host.

  Germany

• Office.euEU sovereign

  100% European office suite from The Hague, built on open-source (Nextcloud), EU-only data centres

  Netherlands

• Open-XchangeEU sovereign

  European open-source email, calendar, and productivity suite

  Germany

• OpenTalkEU sovereign

  German open-source video conferencing platform with focus on privacy and GDPR

  Germany

• Rocket.ChatNon-EU vendor

  Open-source team communication platform with self-hosting support

  Brazil

• SendRecSelf-hosted / open source

  Open-source (AGPLv3), self-hostable async video messaging platform built for EU data sovereignty; operated by a Romanian sole proprietorship (Bucharest) offering both Docker self-hosting and an EU-managed cloud tier. Note: small, early-stage product (reported ~30 users at time of review) — HQ corrected from proposed generic "EU" to Romania based on legal imprint.

  Romania

• SpacedeckSelf-hosted / open source

  Open-source collaborative whiteboard platform for visual collaboration

  Germany

• TwakeEU sovereign

  Open-source collaboration platform by LINAGORA (chat, files, tasks, calendar, video); absorbed Cozy Cloud in 2025.

  France

• WireEU sovereign

  End-to-end encrypted collaboration platform by Wire Swiss GmbH (Zug, Switzerland)

  Switzerland

• ZimbraNon-EU vendor

  Open-source email and collaboration suite for enterprises

  United States

• ZulipNon-EU vendor

  Zulip is an open-source team chat application with threaded conversations, operated by Kandra Labs, Inc., a US company headquartered in San Francisco, California. Self-hosting is available; the cloud service is hosted by a US entity.

  United States