jMonkeyEngine
An open Java 3D engine with scenes, materials, physics, audio, networking components, and an SDK.
Why use it
jMonkeyEngine lets Java and Kotlin teams retain JVM tooling and share substantial code between desktop and Android.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
Its editor and ecosystem are modest; high-end rendering and shipping targets need project-specific validation.