Prosody IM

Prosody is an open-source XMPP (Jabber) communication server written in Lua under the MIT/X11 license. It solves the problem of relying on proprietary messaging platforms by providing a self-hosted, private alternative for real-time chat. Users retain full control over their communication data and can connect from any device using a wide range of desktop and mobile XMPP client software.

The server is designed to be easy to set up and configure, efficient with system resources, and straightforward for developers to extend. It supports federation, allowing different Prosody installations and other XMPP-compatible services to interconnect into an open communication network while giving administrators control over connections and data sharing. The project provides documentation, a community mailing list, chat room, and blog for support and development.

Prosody is intended for companies, organizations, families, or friends who want a private, self-managed messaging system. As open-source software, it is available for free download with no licensing fees. The website does not specify commercial editions, paid plans, or seat-based pricing, indicating the core server is freely available under the MIT/X11 license.