SteamVR/OpenXR has been a standard for a long time, so pretty much all headsets can work on the platform (and by extension, there are plenty of vr games that run both on Steam and off of steam using the standard, such as the Vivecraft Minecraft Java edition mod :D). As a happy Valve Index owner for several years I am definitely looking forward to upgrading to the Steam Frame and selling my old headset, although I'm not sure when that'll make sense for me personally (since the index still works and plays games well).
Oh yeah some recommendations for good VR games:
- Into the Radius 1 and 2 (STALKER/Metro like experience but VR)
- Half Life Alyx (the one and only)
- Pavlov VR/Contractors (if you like Counterstrike/Battlefield style gameplay)
- VRChat (meeting so many cool people and exploring some crazy worlds)
- Way too many good mods that bring VR gameplay to desktop games (best ones are Vivecraft and SPT VR in my current experience)