@needle-tools/engine/src/engine-schemes/README.md

Needle Engine is a web-based runtime for 3D apps. It runs on your machine for development with great integrations into editors like Unity or Blender - and can be deployed onto any device! It is flexible, extensible and networking and XR are built-in.

Using flatbuffer compiler 2.0
https://github.com/google/flatbuffers/releases/tag/v2.0.0