libGDX
An open-source Java game framework with graphics, audio, input, assets, and multiple backends for desktop, mobile, and web.
Why use it
A mature, code-first JVM ecosystem suits teams that want shared core logic and control over architecture.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
It is not a visual editor engine; teams assemble their own UI, levels, physics, and deployment workflow.