Quake II RTX released back in 2019, with NVIDIA using it to show off more ray tracing effects for their RTX GPUs but now they're done with it.

Quake II RTX released back in 2019, with NVIDIA using it to show off more ray tracing effects for their RTX GPUs but now they’re done with it. It’s still free on Steam and the project behind it is open source, but NVIDIA aren’t doing any more with it now.

Noted on the GitHub page is a message that it has been discontinued, and the GitHub repository has been archived. They did one small final release version 1.8.1 with a few fixes but that’s it now.