Airspace Check
After a cross-country flight you want to know whether you clipped a piece of controlled airspace. The checking itself is done by a Java tool written by Alex Stumpfl; this is the part that makes it usable from a browser.
You upload the .igc track your instrument recorded, the file gets handed to the checker,
and you get back a verdict plus a KML of the flight with the airspace geometry, so you can
see for yourself where the track passed. Uploads are held only as long as the check takes.
One caveat worth repeating: the check assumes TRA Schwarzenberg was active. If that matters for your flight, read the KML rather than the one-line verdict.