WalkTheWeb

WalkTheWeb 3D Internet - Metaverse - Multiverse - Host your own multiplayer Metaverse of 3D Games, 3D Shopping, and 3D Scenes!. Maintained by HTTP3D on GitHub, where it has earned 50 stars from the community.

It's actively developed around 3d-cms, database, javascript, and is a solid reference for anyone building with these tools.