I enjoy playing In Death: Unchained & Pistol Whip on Oculus Quest 2.
Lambda1VR - Port of the Xash3D-FWGS Half Life Engine to Oculus Quest.
LOVR - Virtual Reality Engine.
Virtual Reality DOS - Experimental "PC running DOS" emulator inside a VR environment.
Mozilla Hubs - Share a virtual room with friends. Watch videos, play with 3D objects, or just hang out. (Code)
A-Frame - Make WebVR.
ALVR - Stream VR games from your PC to your Oculus Quest via Wi-FI.
Varjo - Advanced virtual and mixed reality devices.
OpenVR Advanced Settings Overlay - Adds an overlay to the OpenVR dashboard that allows access to advanced settings and useful utilities.