Godot Engine – Multi-platform 2D and 3D game engine
Keeping Impressive Title Open
LibOpenMetaverse is a collection of .NET libraries written in c# for interacting with 3d virtual world simulators. The core library implements the protocol, networking and client functionality.
This is a github mirror of the opensim git repository (synced every 10 minutes). The cannonical master is on http://opensimulator.org/viewgit
A github codespace for working on the SL viewer, maybe.