Game development tools
  
http://www.dmoz.org/Games/Video_Games/Game_Design/Development_Tools_and_Software/  
 e.g. http://game-maker.en.softonic.com/ ; http://www.terraria.org/
 http://www.makeuseof.com/tag/five-free-game-development-tools-make-your-own-games/
http://content.gpwiki.org/index.php/How_do_I_get_Started
http://content.gpwiki.org/index.php/Game_Engines

The class will come up with a list of game development tools.
Each person in the class will select one and consider if it should (or should have been) used in this class.