Since this is a thread about Logbook I would like to add that it does
all those things (detect tow release, flight optimization…). In
addition it is really good at exporting files to other formats like
Google Earth and Google Maps. Each has its pluses and those formats
are great if you would like to share flights with your friends where
you cannot count that they have installed IGC viewer. And you can see
the flights on your desktop (big screen with high resolution).

The program is not free, but it comes together with flyWithCE Flight
Recorder for just 89 EUR. Updates are free of charge (no hidden cost
in the future) and the device is small and really simple to use.
If you would like to know more check Logbook web site:
http://www.flywithce.com/logbook.html.

Best regards

Uros Podlogar
www.flywithce.com