Open Source Team Chat Apps

Self-hosted, single-tenant group chat with real-time rooms, direct messages, Web Push, and file sharing — no subscriptions, no external services.

Open source Loom alternative with GPU-accelerated recording, instant share links, AI summaries, and full self-hosting via Docker Compose.

Local-first, self-hosted workspace that combines real-time chat, Notion-style pages, and structured databases — all synced via CRDTs so you work offline without losing a keystroke.

A polished, self-hostable Matrix client for secure, decentralized messaging and collaboration that puts your organization in full control of its data.

Open-source all-in-one workspace that replaces Linear, Jira, Slack, and Notion for product and engineering teams.

Open-source, end-to-end encrypted video conferencing you can self-host or embed into any web or mobile app.

The official Lark/Feishu CLI tool built for both humans and AI agents, delivering 200+ commands and 26 AI agent skills across 18 business domains from messaging and calendar to docs, sheets, and approvals.

Open core, self-hosted team collaboration with chat, AI agents, voice calling, and deep DevOps integrations — all under your control.

The secure, self-hosted team communications platform for organizations that cannot compromise on data sovereignty.

A free, self-hostable Discord-compatible platform giving you full control over your chat, voice, and video community.

Open-source Flutter Matrix client with federated identity lookup, Vodozemac E2EE, and enterprise white-labeling for decentralized team communication.

Open source end-to-end encrypted messaging for teams and enterprises — self-host for complete control over your communications and data.

Topic-based team chat that brings the structure of email threads to real-time messaging, so distributed teams never lose context across hundreds of concurrent conversations.