Dust Racing 2D (Dustrac) is a tile-based, cross-platform 2D racing game written in Qt (C++).
Play against challenging computer cars or use the split-screen mode to play against your friend. A level editor for easy level creation is included. Dust Racing 2D is inspired by Super Cars and Slicks’n Slide.
The newest releases and source code here: https://github.com/juzzlin/DustRacing2D/releases
Physica is a casual platformer game where the goal is to drive a square through game levels from its starting position to his goal, avoiding hazards and without falling down.
The 2.0 release includes 2 packs of 16 levels each, plus a level editor to make your own ones.
There's also a Portable Apps Format release (still in beta testing: see http://portableapps.com/node/36645 for corresponding thread):
http://sourceforge.net/projects/physica/files/PhysicaPortable_1.0.paf.exe/download
Check out the game website at physica.sourceforge.net
You can also find the repository with game source code here: https://github.com/buch415/Physica
All graphics are released under CC-BY license and can be found here:
http://opengameart.org/content/physica-assets-0