The SL client ("viewer") has been open source for a very long time, and there used to be a thriving ecosystem of third-party forks. Nowadays Firestorm [0] is th

The SL client ("viewer") has been open source for a very long time, and there used to be a thriving ecosystem of third-party forks. Nowadays Firestorm [0] is the one everyone uses. The server software remains closed source. OpenSim [1], a community-driven reimplementation with federation support, has been around for a while but as you say hasn't really gone anywhere since the original wave of metaverse hype died down. [0] https://www.firestormviewer.org https://www.firestormviewer.org [1] http://opensimulator.org http://opensimulator.org