Best self-hosted Team Chat apps

Rocket.Chat

RocketChat/Rocket.Chat

Communications platform that puts data protection first (alternative to Gitter.im and Slack).

Novu

novuhq/novu

Notification infrastructure for developers.

Mattermost

mattermost/mattermost

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

Chatwoot

chatwoot/chatwoot

Customer communication platform (alternative to Intercom and Zendesk).

ntfy

binwiederhier/ntfy

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

Zulip

zulip/zulip

Zulip is a powerful, open source group chat application.

SimpleX Chat

simplex-chat/simplex-chat

The most private and secure chat and applications platform - now with double ratchet E2E encryption.

Apprise

caronc/apprise

Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.

Gotify

gotify/server

Notification server with Android and CLI clients (alternative to PushBullet).

OpenWA

rmyndharis/OpenWA

WhatsApp API gateway exposing messaging as REST endpoints, with a web dashboard, multi-account sessions, and webhook events (alternative to WhatsApp Business API providers).

Element

element-hq/element-web

Fully-featured Matrix client for Web, iOS & Android.

Tinode

tinode/chat

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.

Centrifugo

centrifugal/centrifugo

Language-agnostic real-time messaging (Websocket or SockJS) server.

Screego

screego/server

Screego is a simple tool to quickly share your screen to one or multiple people via web browser.

Typebot

baptisteArno/typebot.io

Conversational app builder (alternative to Typeform and Landbot).

Fluxer

fluxerapp/fluxer

Instant messaging and VoIP platform built for friends, groups, and communities (alternative to Discord).

Mumble

mumble-voip/mumble

Low-latency, high quality voice/text chat software.

WorkAdventure

workadventure/workadventure

Virtual office / virtual conference application presented as a 16-bit RPG video game.

Synapse

element-hq/synapse

Server for Matrix, an open standard for decentralized persistent communication.

One Time Secret

onetimesecret/onetimesecret

Share sensitive information securely with self-destructing links that are only viewable once.

Tox

TokTok/c-toxcore

Distributed, secure messenger with audio and video chat capabilities.

Stoat

stoatchat/self-hosted

Stoat is a user-first chat platform built with modern web technologies.

WBO

lovasoa/whitebophir

Web Whiteboard to collaborate in real-time on schemas, drawings, and notes.

Tuwunel

matrix-construct/tuwunel

High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit).

AnyCable

anycable/anycable

Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.

Chitchatter

jeremyckahn/chitchatter

Peer-to-peer chat app that is serverless, decentralized, and ephemeral.

Live Helper Chat

LiveHelperChat/livehelperchat

Live Support chat for your website.

RetroShare

RetroShare/RetroShare

Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.

GlobaLeaks

globaleaks/globaleaks-whistleblowing-software

Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.

Databag

balzack/databag

Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls.

Hyphanet

hyphanet/fred

Anonymously share files, browse and publish freesites (web sites accessible only through Hyphanet) and chat on forums.

Notifo

notifo-io/notifo

Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin.

OTS

Luzifer/ots

One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.

Spectrum 2

SpectrumIM/spectrum2

Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.

Shhh

smallwat3r/shhh

Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates.

PushBits

pushbits/server

Notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.

Tiledesk

Tiledesk/tiledesk

All-in-one customer engagement platform from lead-gen to post-sales, from WhatsApp to your website. With omni-channel live agents and AI-powered chatbots (alternative to Intercom, Zendesk, Tawk.to…

SAMA

SAMA-Communications/sama-server

Next-Gen self-hosted chat server and clients.