The Australian Gliding world uses OzFlarm. It's basically a collision avoidance awareness system, but is used as a back up to the pilots LOOKOUT! The ozFlarm is also used as a datalogger, which logs a 3D point in the atmosphere every 4seconds so that the pilots can analyse their flights for better performance next time.
Swift Avionics
I took this up with me a few times when flying commercially, to analyse how I could become a more safe and efficient pilot. One interesting thing I found when bashing around in a BE58 and PA32, if the runway direction was more than 35* off your flight plan track, it was quicker to go for a crosswind or downwind than to deviate for the 5nm final
go_soaring! instead