Rec Room Studio

Rec Room Studio (RRS) is a tool for PCs that creators can use to use the Unity game engine and other programs (such as Blender, Maya, etc) to make better and higher quality rooms. Creators can check to see if they have full access to RRS at https://rec.net/settings/recroomstudio . Creators that don't meet the specific requirements on the page have limited access, which lets them test out RRS, but not publish their creations to Rec Room servers. Some notable creators who have been given access to this tool are Tonic, TopShelf, Smoce, TopNotch, Hairy, Recroom Incorporated, Alexa, etc.

Alexa maintains The Community RR Studio Manual with a lot of documentation.