Games and templates that do not require SMART software:
http://jeopardylabs.com/ allows you to create a customized Jeopardy template without PowerPoint.
http://www.superteachertools.com/ allows you to create Flash classroom review games.
http://www.superteachertools.com/jeopardy/download.php allows you to create a Flash Jeopardy game.
http://people.uncw.edu/ertzbergerj/ppt_games.html for downloadable PowerPoint game templates.
http://www.math-play.com/index.html to play math games.

Games and templates created with SMART Notebook software:
SMART Exchange to search for lesson plans and games.
http://ms.ardsleyschools.org/resources/smartboard-game-templates for SMART board games templates.

Get a 30-day free trial at http://www.quia.com/web to create and share games.