Prosody
Prosody is an open-source, lightweight XMPP (Extensible Messaging and Presence Protocol) server written in Lua, designed for real-time communication such as instant messaging, presence, and multi-user chat. It provides a modular architecture that allows easy extension and customization, supporting features like federation, encryption, and integration with other services. It is commonly used for building chat applications, IoT messaging, and collaborative tools.
Developers should learn Prosody when building real-time communication systems that require standards-based interoperability, such as enterprise chat platforms, educational tools, or IoT device messaging, due to its compliance with XMPP protocols. It is particularly useful for projects needing federation across different servers, strong security with TLS and SASL, and lightweight resource usage compared to heavier alternatives like ejabberd.