Kosmi is a free real time application and communication platform that offers voice, text and video calls along with games and applications such as SNES Party, NES Party, OpenArena, Poker, Virtual Cardtables, Synced YouTube and Cowatch Video.
Iceland
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Matrix Alternatives
Matrix is described as 'Defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to Matrix for a variety of platforms, including Android, Web-based, Linux, Mac and Windows apps. The best Matrix alternative is Signal, which is both free and Open Source. Other great apps like Matrix are Telegram, Element, Discord and Pidgin.
filter to find the best alternatives
Matrix alternatives are mainly Group Chat Apps, but if you're looking for Instant Messengers or Encrypted Chat Apps you can filter on that. These are just examples - use the filter bar below to find more specific alternatives to Matrix.
Alternatives list
- 154 Kosmi alternatives
21 Vector Private Messaging alternativesVector encompasses the ideals of freedom through free and open-source technology, using a "Privacy by Principle" approach. This means that privacy is not a feature or add-on, but the core foundation that Vector is built upon, which is granted and accessible to everyone.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Mac
- Windows
- Linux
- Android
- Android Tablet
Experience a new way to connect with your people online. Join an existing community space or launch your very own branded platform tailored to your audience.
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Converse is a messaging app for decentralized, secure, end-to-end encrypted conversations. Built on the XMTP network, Converse lets you own your conversations and take them anywhere whenever you want, ensuring your most important messages—the ones you never want to lose or be...
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StrafeChat is a web application focused on no censorship. We believe that people with any belief, opinion, or view should be able to communicate with each other freely.
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 scalable, it is used to power web scale deployments across many software industries.
Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
27 Nerimity alternativesNerimity is an open-source, community-first chat platform built to deliver an elegant, powerful, and feature-rich experience.
Cost / License
- Free
- Open Source (GPL-3.0)
Application type
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- Android Tablet
- Self-Hosted
![Profile Interface [PC - 2025]](https://d4.alternativeto.net/ofSvW79onBnQ3dT4TP6mtngdCU88FNmqv5Tk5xCMz3Q/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL25lcmltaXR5Xzk5MzIyMl9mdWxsLnBuZw.jpg)
![Messages View [PC - 2025]](https://d4.alternativeto.net/Z0YhJMypz3Q3jnFWOjqYGTwVNkh5k6s3SQM5l8Rg4kE/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL25lcmltaXR5XzI4MTQxOF9mdWxsLnBuZw.jpg)
![Server Discovery [PC - 2025]](https://d4.alternativeto.net/_po627STDjCCAfef0rngPK2upDDN9PY06d80lUQ6faQ/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL25lcmltaXR5XzI4MjUwOF9mdWxsLnBuZw.jpg)
+2![Server Settings [PC - 2025]](https://d4.alternativeto.net/HQXrz0MnXBYtci2x26TfzVWpl2vrnm3kv_dbF23jwLE/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL25lcmltaXR5XzYyODAyOF9mdWxsLnBuZw.jpg)
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Tigase is an open source (AGPL3) project started by Artur Hefczyc in October 2004 to develop an XMPP server implementation in Java.
Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
United States
United Kingdom
