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.
Nextcloud server, a safe home for all your data
Take control over your live stream video by running it yourself. Streaming + chat out of the box.
Etherpad: A modern really-real-time collaborative document editor.
The Secure CommsOS™ for mission-critical operations
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
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
A decentralised discussion platform for communities.
A complete web conferencing system for virtual classes and more!
Keep passwords and other sensitive information out of your inboxes and chat logs.
Movim - Decentralized social platform
AI-powered development workspaces with reusable components, architectural clarity and zero overhead.
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
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.
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.
Slack API in Go
Orchestrate end-to-end encryption, cryptographic identities, mutual authentication, and authorization policies between distributed applications - at massive scale.
Collaborative office suite, end-to-end encrypted and open-source.
HedgeDoc - Ideas grow better together
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.
Self-hosted collaborative bookmark manager to collect, read, annotate, and fully preserve what matters, all in one place.
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
Specifically replacing
These categories on ossreplace cover the SaaS in this space.
Ready to self-host?
Most operators land on server (top health) and run it on hetzner for around $4.13/mo.