I came across a site that contains several game templates (PowerPoint, Excel, Word) that can be used in just about any classroom.  Game templates can take a great deal of time to create, but this site shares many that can be downloaded for free.

Check out EdGames site by clicking here.
 
"Are you looking for fun, yet educational, online science games for your students to play to reinforce important curriculum concepts?  Here's a list of websites that will help you find free educational science games!"

Click here to check out the site hosted by Simple K12.
 
"Tony Mangiacapre, high school physics teacher of St. Mary's High School in Manhasset, NY, has combined his degree in instructional technology with modern communications to enhance his own classroom instruction and incorporate new methods of learning and sharing instructional strategies with teachers worldwide. He has taken the entire New York State physics curriculum and put it on a Website, which contains his daily lesson plans with graphics, Flash animation, simulations, interactive games and exams and YouTube videos. These lesson plans are shared with teachers throughout the United States, England, Scotland, Australia, New Zealand and other countries." - From Tech & Learning