Veusz is a scientific plotting package, designed to create publication-ready Postscript, PDF, or SVG output. It features an easy to use graphical interface as well as a command line interface and can be scripted or embedded in Python scripts. Graphs are constructed in a modular fashion from separate components. Datasets can be interactively modified or created from within the program.
Quassel IRC is a modern, cross-platform, distributed IRC client, meaning that one or more clients can attach to and detach from a central core, much like the popular combination of screen and a text-based IRC client, but graphical. In addition to this unique feature, it aims to be a comfortable chatting program.
DireKtion is a satellite navigation project based on data from OpenStreetMap.org. It aims to provide a free (not just as in beer) satellite navigation solution for any vehicle/person that can carry a Linux device. It is able to calculate a route between any two points on a map, and displays directions for traveling between them.