# Open-source alternatives for Team chat

> Self-hosted team messaging with channels, threads and calls that replaces paid workplace chat.

## Paid products
- [Open-source alternatives to Slack](https://repoquarry.dev/alternatives/slack.md): Hosted workplace chat sold by subscription, with channels, direct messages, threads, huddles for voice and video, an app and bot ecosystem, and searchable message history. Pricing: See pricing page.
- [Open-source alternatives to Zoom Workplace Pro](https://repoquarry.dev/alternatives/zoom.md): Zoom Workplace offers paid video meetings and collaboration tools. These alternatives cover meetings and screen sharing; Zoom Phone, webinars, AI Companion and the complete Workplace bundle are outside this comparison. Pricing: See pricing page.

## Top ranked projects
1. [Rocket.Chat](https://repoquarry.dev/projects/rocket-chat.md): Open core, self-hosted team chat with channels, threads, DMs, apps and federation; free Starter (50 users) and MIT Community editions. Commercial use: Partial.
2. [Mattermost](https://repoquarry.dev/projects/mattermost.md): Open core, self-hosted team chat with channels, threads, calls, playbooks and integrations; a single Go binary backed by PostgreSQL. Commercial use: Partial.
3. [Jitsi Meet](https://repoquarry.dev/projects/jitsi-meet.md): Apache-2.0 browser video conferencing with screen sharing, in-call chat and polls; self-host it for calls alongside a team chat. Commercial use: Confirmed.
4. [Zulip](https://repoquarry.dev/projects/zulip.md): Apache-2.0 team chat built around topic-based threads in channels, self-hosted on Ubuntu or Debian or used as hosted Zulip Cloud. Commercial use: Confirmed.
5. [Buzz](https://repoquarry.dev/projects/buzz.md): Block's self-hostable workspace where people and AI agents share channels, threads, DMs, canvases, workflows and git, built on a Nostr relay. Commercial use: Confirmed.
6. [Fluxer](https://repoquarry.dev/projects/fluxer.md): AGPL-3.0 instant messaging and VoIP app for groups and communities, with desktop and mobile apps and a free Docker self-host path. Commercial use: Partial.
7. [Synapse (Matrix) with Element](https://repoquarry.dev/projects/synapse.md): Reference Matrix homeserver from Element; pair it with Element apps for federated, end-to-end encrypted rooms, DMs, threads and calls. Commercial use: Partial.
8. [Stoat (formerly Revolt)](https://repoquarry.dev/projects/stoat.md): Discord-style chat platform (renamed from Revolt) with servers, channels, DMs and voice/video, self-hostable with Docker. Commercial use: Partial.
9. [Wire](https://repoquarry.dev/projects/wire.md): Backend for Wire, an end-to-end encrypted business messenger with teams, conversations and calls, self-hostable on Kubernetes. Commercial use: Partial.
10. [Nextcloud Talk](https://repoquarry.dev/projects/nextcloud-talk.md): Chat, audio and video calls and screen sharing as a Nextcloud app, with bots, webhooks, federation and Nextcloud Files integration. Commercial use: Partial.
11. [Campfire (ONCE)](https://repoquarry.dev/projects/campfire.md): Basecamp's simple MIT-licensed group chat with rooms, DMs, file attachments, search and bot API, shipped as one Docker image. Commercial use: Confirmed.
12. [Tuwunel](https://repoquarry.dev/projects/tuwunel.md): Lightweight Matrix homeserver in Rust, successor to conduwuit; a Synapse alternative to use with Element or other Matrix clients. Commercial use: Confirmed.
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Source: RepoQuarry (https://repoquarry.dev/categories/team-chat). Data licence: CC BY 4.0. Quotes are from project documentation and belong to their authors.