The Quarks operating system is the attempt to write a small microkernel-based operating system, mainly for educational purposes.
nice small Webinterface for HTDIG Searchengine
Measure bandwith- and latency tracks with your mobile GPS device. speedTracker can be used with mobile phone (J2ME application) or usual laptop with GPS mouse and 3G card (JAVA application). See <a href="http://www.speedtracks.org">speedTracks.org</a>.