I'd like to volunteer my game "The Butterfly Effect" - see
It's a physics puzzle game, written in C++ and Qt.
The code is licensed under the GPLv2 license - with "GPLv2 only" clause.
Graphics (almost all SVGs) are under varying licenses, including PD, GPLv2,
BSD and CC. Game development happens entirely in the open - we use an SVN
repository on sourceforge.net .
Klaas van Gend