Spectrum 2

Spectrum 2 provides a transport layer that connects users across distinct instant‑messaging networks, enabling them to exchange messages without needing to be on the same service. By operating as a bridge, it forwards traffic between the supported protocols, so participants can converse seamlessly even when their accounts belong to different providers. The software is released under the GPL‑3.0 license, is self‑hostable, and can be run on a personal server without subscription fees or tiered pricing.

It is targeted at individuals or groups who wish to maintain communication across multiple IM platforms while retaining control over their data and infrastructure. Because it is open source and libre, users can inspect, modify, and redistribute the code to suit their own requirements. The project is marked as stable, indicating that its core functionality is mature and ready for production use.

Installation involves downloading the package and configuring it on a server, after which the transport can be activated to route messages between the linked networks. Documentation and community discussion are available through the project’s website.