This is the viewer that was the Oculus Rift enabled viewer for Second Life. Today, 6/21, I see that the viewer has been removed from the Third Party Viewer directory at the viewer maker’s request.
Early versions of the viewer were based on Linden Viewers and later versions on the Firestorm Viewer.
There is no current version of a viewer that supports the Oculus Rift, AFAIK. The Linden Viewer is in the process of being updated. But, we have not seen a release in over a year. Later this month the SSL/TLS security change will make the only available Linden made viewer with Oculus support about useless.
It is hard to say what the Lab’s priority is for getting a usable Oculus capable viewer out. We have known the Lab to pull people off the update project to handle problems they consider more pressing.