Self-hosted team chat, Slack alternatives that own your message history
Slack charges $7-12 per user per month and locks message history behind paywalls. Self-hosted Mattermost, Rocket.Chat, and Zulip give the same channels, threads, and integrations on your infra.
The 24 picks, ranked by health
Health score is a 6-dimension composite. See methodology.
The Secure CommsOS™ for mission-critical operations
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
A decentralised discussion platform for communities.
The easy-to-use open source Business Intelligence and Embedded Analytics tool that lets everyone work with data
Nextcloud server, a safe home for all your data
SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps !
Modern, responsive, cross-platform, self-hosted web IRC client
Keep passwords and other sensitive information out of your chat logs and inboxes.
A complete web conferencing system for virtual classes and more!
Movim - Decentralized social platform
Take control over your live stream video by running it yourself. Streaming + chat out of the box.
Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.
Live Helper Chat - live support for your website. Featuring web and mobile apps, Voice & Video & ScreenShare. Supports Telegram, Twilio (whatsapp), Facebook messenger including building a bot.
Etherpad: A modern really-real-time collaborative document editor.
Orchestrate end-to-end encryption, cryptographic identities, mutual authentication, and authorization policies between distributed applications - at massive scale.
The extensible chat client.
MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
High-Performance server for NATS.io, the cloud and edge native messaging system.
The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles
Collaborative office suite, end-to-end encrypted and open-source.
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
Web-based XMPP/Jabber chat written in JavaScript
An XMPP server licensed under the Open Source Apache License.
Specifically replacing
These categories on ossreplace cover the SaaS in this space.
Ready to self-host?
Most operators land on Rocket.Chat (top health) and run it on hetzner for around $4.13/mo.