Tag
16 catalogue entries use this topic; each Project's license policy is labeled separately.
Polished chat interface for many model providers
LobeChat is the most designed of the open chat front ends. Plugins, an assistant marketplace, voice input and output, and vision support are all present, and the interface holds up next to commercial products.
Open-source community platform for discussion, chat, and support
Discourse is a self-hosted community platform that combines threaded discussion with built-in chat, search, and moderation tools.
Team messaging for organisations that cannot use hosted chat
Mattermost is channel-based team chat designed for environments where the message history has to stay inside a boundary: defence, healthcare, and regulated finance are its natural constituency.
Free open-source chat with voice, video, and self-hosting for communities
Fluxer is a free, self-hostable chat and VoIP app for friends, groups, and communities, with channels, voice, video, and screen sharing.
Local-first workspace combining chat, pages, databases, and files.
Colanode is a local-first collaboration workspace combining real-time chat, rich-text pages, databases, and files.
Self-hosted group chat with rooms, DMs, and @mentions
Campfire is a self-hosted group chat system with rooms, direct messages, @mentions, search, and file attachments, built by 37signals.
Simple, elegant Matrix chat with end-to-end encryption
Cinny is an open-source Matrix client with a simple, elegant interface for encrypted direct messages and group conversations.
End-to-end encrypted messaging and collaboration for enterprises
Wire is an end-to-end encrypted messaging and collaboration platform for enterprises and governments, with open-source clients and cloud or on-premises hosting.
Open-source team and community chat with voice, video, and bots
Mezon is an open-source, AGPL-3.0 community chat platform with clan-based text, voice, and video channels plus bots and apps.
Open-source community platform with planets, chat, voice, and wikis
Valour is an open-source community platform where communities called planets get chat channels, thread feeds, wikis, voice and video calls, and roles.
Free open-source team messenger built on the Matrix protocol
Twake Chat is a free open-source messenger by Linagora built on the Matrix protocol, with encrypted chats, on-premise hosting, and Android, iOS, and web apps.
OpenAI's assistant and the interface that set the pattern
ChatGPT is the product that made conversational assistants ordinary. Beyond the chat box it now covers file analysis, image generation, web browsing, voice, and custom assistants sharing one account.
Anthropic's assistant, strongest on long documents and code
Claude is positioned around careful reasoning over long inputs. The large context window makes whole-repository and long-document work practical in a way that shorter context assistants cannot match.
Voice, video, and text communities organised into servers
Discord was built for people who wanted to talk while doing something else, and that origin still shapes it. Persistent voice rooms you drop into, rather than scheduled calls, is a genuinely different model from workplace chat.
Chat, calls, and files bundled into Microsoft 365
Teams wins on bundling rather than on craft. If an organisation already pays for Microsoft 365, Teams arrives at no additional cost with identity, files, and calendar already wired together.
Channel based team messaging with a large integration ecosystem
Slack replaced internal email for a generation of companies by making conversation searchable and public by default. Channels, threads, and a very large app directory are the shape most team chat now copies.