Alternatives to Matrix.org for all platforms with any license

Dialog Messenger

Dialog Messenger is a customized self-hosted platform usable across multi operation systems simultaneously. dialog provides SDK tools for client interface as well as for...

Free Personal Mac Windows Linux Web Android ... iPhone Self-Hosted
Encrypted chat Reactions Real time collaboration Team work ... Text chat Add a feature

24 Like
ZeroChat

An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet...

Free Open Source Mac Windows Linux Web Self-Hosted ... Python JavaScript ZeroNet
Decentralized Distributed Add a feature

8 Like
Telegram X

An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features. The goal of Telegram X is to reinvent Telegram and...

Free Android iPhone Android Tablet iPad
Ad-free Chat Bot Cloud sync Integrated File Sharing ... Stickers Support for Themes Voice Call Add a feature

8 Like
Spectrum Chat

A newly open sourced self hosted Slack like alternative for building persistent chat communities.

Freemium $ $ $ Open Source Web Self-Hosted
Group chat Group collaboration Support for @mentions Real time collaboration ... Team Collaboration Team work Add a feature

6 Like
MongooseIM platform

The massively-scalable XMPPJabber mobile messaging platform, for mobile and web, by Erlang Solutions.

Free Open Source Mac Linux Amazon Web Services Microsoft Azure
Voice Call Add a feature

11 Like
Openfire

Openfire (formerly Wildfire) is a cross-platform instant messaging (IM) and groupchat server. It uses the only widely adopted open protocol for instant messaging, XMPP...

Free Open Source Mac Windows Linux
Group chat Real time collaboration Add a feature

13 Like
VideoMeeting

VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is a pure web application based on WebRTC...

Free Open Source Web Chrome OS Self-Hosted
Video calling Web-Based Add a feature

4 Like
TribeScale

TribeScale is a startup that aims to enhance teamwork in companies through the improvement of communication, coordination, and the pace on the basis of targets set.

Free Mac Windows Web Android iPhone ... iPad Self-Hosted
Goal setting Goal Tracking Group chat Group collaboration ... Real time collaboration Team Collaboration Team work Add a feature

24 Like
Ripcord

Ripcord is a desktop chat client for group-centric services like Slack and Discord. It provides a traditional compact desktop interface designed for power users....

Free Mac Windows Linux Discord Slack
Slack client Slack integration Add a feature

3 Like
Sblack

How is this different than Slack official client? This is not an Electron app, so its size is 20 MB instead of 180 MB. It also launches faster than the official client....

Free Mac Slack
Slack client Night mode/Dark Theme Slack integration Add a feature

3 Like
Stride

Stride is the complete team communication solution with group messaging, video meetings, and built-in collaboration tools.
- Discontinued https://alternativeto.net/software/slack/ is acquiring https://alternativeto.net/software/hipchat/ and Stride from Atlassian. The services will be discontinued after February 15th, 2019. https://www.atlassian.com/partnerships/slack
Freemium $ $ $ iPhone iPad
App integration Group chat Group collaboration Video calling ... Voice Call Add a feature

3 Like
Prosody

Prosody is a modern flexible communications server for Jabber/XMPP written in Lua. It aims to be easy to set up and configure, and light on resources. For developers it...

Free Open Source Mac Windows Linux Web BSD
No features added Add a feature

9 Like
ejabberd

ejabberd is an open source Jabber/XMPP server designed from the ground up to be the building bricks of highly critical messaging systems. Designed to be massively...

Free Open Source Mac Windows Linux
No features added Add a feature

13 Like
dirc

Peer-to-peer IRC-inspired self-hosted serverless web browser chat. Chat from your browser.

Free Open Source Mac Windows Linux Web Android ... iPhone Chrome OS Self-Hosted
Group chat Add a feature

1 Like
Wey

Fast open source Slack desktop app, written in Node.js with native UI powered by the Yue library.

Free Open Source Mac Windows Linux
Slack client Add a feature

1 Like