XCSoar, the greatest! This is the best free app for flying on the planet. But Top Hat has a better interface.
I love it and use it on every flight. Most of my flights are short and it automatically breaks the flights into separate IGC files so I can upload to OLC. It took me less than an hour to get the terrain file and airspace files running.
Use it every flight! I love xcsoar, there are a few niggles but it's amazing for a free piece of software, recommended to all!
Best till now Highly customizable
Doesnt Work No load up, just a white sceen and finding GPS location!
* two crash bugs fixed
* NMEA over TCP fixed on Windows
* fix overlapping text on the Kobo
* fix USB-RS232-OTG permissions on Nook