Java library for detecting that the (desktop) operating system uses dark UI theme or not

NetLogo

spring-boot-jfx

Spwing provides a rapid cross-platform application development framework built on top of Java Swing and the Spring framework

Compose Multiplatform rendering and event execution engine for the Mosaic Server-Driven UI framework.

A Compose Desktop UI framework supporting global theme control. (aka LintUI)

A small environment with robot agents used for teaching programming basics