ImageZen is a GUI frontend for ImageMagick. It performs most common image manipulation tasks supported by ImageMagick with a pleasant interface. It also allows you to perform batch operations and includes the viewer mirage.
oobash is an oo-style framework for bash 4 written in bash. It provides tools for rapid script development and huge libraries.
A stock market application.
An IRC bot able to run multiple bots in the same process and more.