>>328314790
Vrchat is basically photon networking and voice, finalIK, and worlds/avatars as assetbundles hosted on AWS S3. Photon itself is expensive and has a bunch of probably better alternatives out there. VR arm IK is a decent 3 point IK alternative for finalIK. And if you want to go full of open source meme, the devs of https://github.com/V-Sekai/ are aiming to make a vrchat-like metaverse on the godot engine. Nothing useable yet afaik, but it's been interesting to follow.