JGrit is a program that converts images from common formats (e.g. GIF, JPEG, BMP, and PNG) to source code that can be used to render the image on either the Game Boy Advance (GBA) or the Nintendo DS (NDS) system. There are already programs that do this, but none that play nicely with both Windows and Linux. It uses the grit command line tool as a backend.
GuiHelper is a very simple utility for designing Java Swing-based GUIs. It lets you add components such as JButton and JTextField into a JFrame and set their width, height and position. Finally you can generate the related Java code.