Gaphor is a UML modeling environment written in Python. Gaphor is small and very extensible.
The repository is located at http://github.com/gaphor/gaphor.
RPM Thumbnailer is small application that adds small icon (if exists) representing software contained in RPM package. It is inspired by deb-thumbnailer (http://www.omgubuntu.co.uk/2010/06/that-was-quick-new-deb-thumbnailer.html).
A small, portable, client/server GUI designed to work on many types of hardware, including handheld computers and other embedded systems. For more information and downloads, see http://picogui.org