Comment Just to sort things out... (Score 4, Informative) 95
Firstly, under a commercial license (which is ~$1000)
Secondly, under the GPL for non-commercial usage only
However, QT for Windows is not released under the second license, meaning that if you want to develop with QT and the Windows platform - even if you are a non-commercial entity - you must purchase a commercial license (or manage to persuade the nice folk at TT to grant you a license, as a few open source projects have managed to do).
I feel this limits the target market... as one of the reasons to even begin coding in QT (other than the WONDERFUL documentation
Anyway, as I develop primarily for *nix platforms, this is not a big issue for me, but I would like to see QT opened up for the windows platform. That way I'm not limited in the future if I decide to work with another platform.