Open-Source Alternatives
Free Alternative to Slack
10 free & open-source projects that replace Slack.
Compare at a Glance
Top 8 of 10| vs Slack |  rocket-chat |  mattermost |  buzz |  zulip |  arcane |  synapse |  cumora |  stoat |
|---|---|---|---|---|---|---|---|---|
| Stars | 46k | 39k | 36k | 26k | 8.0k | 4.7k | 4.0k | 3.4k |
| Forks | 14k | 9.0k | 4.8k | 10k | 338 | 637 | 530 | 397 |
| Contributors | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Last Commit | Mar 6, 2026 | Mar 6, 2026 | Aug 23, 2026 | Feb 7, 2026 | Mar 6, 2026 | Mar 5, 2026 | Aug 23, 2026 | Mar 5, 2026 |
| License | MIT | GNU GPL-3.0 | Apache-2.0 | Apache-2.0 | BSD-3-Clause | AGPL-3.0 | MIT | AGPL-3.0 |
| Language | TypeScript | TypeScript | Rust | Python | Go | Python | TypeScript | Rust |
Tired of costly communication platforms like Slack for your team?
Converse.js offers a robust, browser-based XMPP chat client designed for real-time messaging. Integrate it seamlessly into your web environment and empower your team with a reliable, private communication solution without the enterprise price tag.
💬 Instant Messaging ⏱️ Real-Time Chat 🌐 Browser Access 🔒 Secure Conversations 👥 Group Messaging
Enjoy truly free, self-hosted real-time communication. No hidden costs, no subscription ever.
Discover the power of open-source team communication. Learn more and get started with Converse.js today: https://fossy.dev/conversejs/converse.js
#OpenSource#FreeSoftware#ChatClient#XMPP#TeamCommunication#WebChat#RealTimeMessaging
