Orx
Orx is a modular open C and C++ game engine with rendering, animation, physics, audio, input, assets, and a configuration-driven object system.
Why use it
Small teams iterate quickly without a heavyweight editor and can tune content through hot reload.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
The workflow favors code and configuration; ecosystem and visual tooling are smaller, and platform extensions need validation.