It's a known fact that ninjas like open source. There are many good reasons for releasing your source code into the open, but in the end we do it because it feels right.
The Fly app was originally hacked up over a weekend in late 2010, but has been polished a bit since then (although there are still some rough edges here and there). The Qt version has been published in Ovi Store (both for Symbian and MeeGo) and Google Play (experimental) and we've had some pretty good download numbers, for a local app.
That's not to say that it's anywhere near perfect. There are lots of improvements that can be made. If you feel like improving it, the sky is the limit! (pun intended ;) ).