A downloadable program for Windows
Tesseract is a VR client for connecting to virtual worlds, inspired partly by LPMuds but mostly by Neal Stephenson's novel Snow Crash, and ultimately intended for taking your custom avatar adventuring through other people's imaginations.
A sample VR server that you can run for yourself is available at github.com/dichro/intangible. By default, Tesseract will connect you to the Intangible Gallery, a showcase of found 3D art, that is built on the same codebase.
Tesseract requires the HTC Vive and Windows.