Meshoptimizer
https://github.com/infosia/meshoptimizer

gltf Optimizer
https://github.com/infosia/meshoptimizer/tree/VRM/gltf

Simplyon notes
https://simplygon.com/
https://www.youtube.com/watch?v=RZxo-2cAFk0
https://github.com/microsoft/Simplygon-DCC-Integrations
https://github.com/microsoft/Simplygon-API-Examples

For VRM export scripting
https://vrm-addon-for-blender.info/en

Instant Meshes
https://github.com/wjakob/instant-meshes
https://github.com/VerbalTea/instantmesher

Material & Baking
https://github.com/TehMerow/PBR_Bake_Tools
https://github.com/GarikDog/autobake_tools

CATS -> baking & optimization for VRCHAT
https://github.com/absolute-quantum/cats-blender-plugin#0180