>>408383423
Lavender just moved to Unreal 5.1
https://store.steampowered.com/news/app/886710/view/3486377495271507727

there's also V-Sekai: https://v-sekai.org/
https://github.com/V-Sekai
which might be a good open-source bastion now that the actual game repo is visible

and of course there's CVR if you want another Unity Scene Viewer that uses basically the exact same version of Unity that VRC does
Neos is cool but I haven't heard any updates about the dev team versus cryptofag drama
Helios is Unreal but pretty dead and unknown dev team from my point of view