A wide variety of game engines are registered in the Game Engines Database, including Murder Engine, Narrat Engine, Defold, Godot, Unreal Engine, and GameMaker. At the time of writing, you can ...

Java FX - new hotness, integrates 2D and 3D controls, views, etc. - Java FX Scene Builder 2.0 allows you to build a Java FX GUI SWT - from Google; haven't used it, but its supposed to be better ...

Deployment on App Engine is done using an app.yaml file, where developers specify runtime: java11. By specifying an extra entrypoint parameter in app.yaml, developers can customize Java command flags.