PieDock is a task bar which is a little bit like the famous OS X dock but in shape of a pie menu. Runs on Linux, BSD and Solaris. Get it here:

markusfisch.de/PieDock

This video shows its main features and how it looks and feels in a real world environment.

Fluxbox Style:
Graphite Integration by Mark Riedesel
klowner.com/themes/graphite_integration/

Background:
Aurora by Piotr Karwowski
pkarwowski.deviantart.com/#/d1st09c

Icons:
Different sources, copyright to their respective owners.