PRIMA homepage Computers, Open Source, Software, GUI - Prima. Toolkit for multi-platform GUI development. http://www.prima.eu.org/
Open source GUI for less powerful or old computers. Computers, Open Source, Software, GUI - KronoJunior. Open source GUI for less powerful or old computers. https://kronojunior.sourceforge.net/
Java Gui Builder Project Home Computers, Open Source, Software, GUI - Java Gui Builder. An engine that reads XML files describing graphical user interfaces layout. https://jgb.sourceforge.net/