pydsl is an environment for creating and using formal and natural languages. The main idea is to allow an easy way to define, use, and combine DSLs to create programs.
cdist allows you to manage hosts and networks with a simple commandline interface.
It stores inventory information in a cconfig database and adapts to your environment by supporting custom backends.
ctt provides commandline time tracking for geeks.
An XML user interface generator for Swing.
A vte-based terminal emulator.