Nochat is an experimental project that can run some VRChat prefabs with the Unity Editor in VR, without the VRChat SDK installed.
Since UdonSharp is just a subset of C#, VRChat prefabs can be repurposed into plain Unity OpenXR prefabs, without needing a single line of executable code from VRChat.
Read more: https://docs.hai-vr.dev/docs/research/nochat
nochat-f2.mp4
Not only VR runs in-editor, regular code debugging tools can be used, including hot reloading. There is no Udon involved.
nochat-invr-f.mp4
This footage was recorded inside the Unity Editor. This is not VRChat.