GameMaker: Studio caters to entry-level novices and seasoned game development professionals equally, allowing them to create cross-platform games in record time and at a fraction of the cost! In addition to making games development 80 percent faster than coding for native languages, developers can create fully functional prototypes in just a few hours, and a full game in just a matter of weeks.
Link to GameMaker Studio Official Page
Link to GameMaker Studio on Steam
The free version has a lot of features missing, you can use Mac OS X Export, Windows PC Export and Windows 8 Export. The prices of commercial editions range from 50 to 800 dollars.
What type of games can you make with this? Here is a video.