Moss is a collection of Java classes which includes additional custom Swing components (Tri state check boxes, complete password entry dialogs.
It's also a JFrame/JDialog framework to assist in creating large GUIs), file and image modification classes (EXIF/IPTC reading and editing, image roatation, file copying), miscellaneous data structures (such as a HeapSet implemenation), and much more
Please feel free to take a look around and see what you think. There is a javadoc page where you can browse the API methods.
Moss is released under the GPL. If you need to use this in a closed source, commercial application, please contact me - I have licensed some of my open source classes to be used in closed source works before; depending on your needs, I may be able to accommodate you.