CuSoft Polar Explorer - http://www.trimill.com/CuSoft/ Downloadable fully functional version of Polar Explorer (for DOS) which will work under Windows. Use it for analyzing theoretical and practical aspects of glider performance in any conditions.
Status Code: 200 - Location: http://www.trimill.com/CuSoft/index.htm
IGCview - http://www.trimill.com/CuSoft/ Program written in Java and is capable of reading, analysing and scoring multiple IGC files. Facilities for comparing multiple flights.
TurnSafe TP Quadrant Calculator - http://www.soarlog.info/ An online JavaScript program to help glider/sailplane pilots using only a GPS to decide when the FAI 90° quadrant at each turning point has been entered.