opensa

An open-source, from-scratch game engine built compatible with RenderWare (the GTA San Andreas engine) — runs SA assets and mods in the browser (DFF/TXD/COL/IMG, IPL/IDE world streaming) with Rapier physics. Maintained by AlexSergey on GitHub, where it has earned 152 stars from the community.

It's actively developed around gta, gtasa, react, and is a solid reference for anyone building with these tools.