Don't be fooled by the name---this Australian site has several free, downloadable executable files for creating customized learning games for any subject for your students.
Even though the programs for the interactive tasks are not listed as working in windows 7, they do... Program files are WINDOWS-based.
I use the activities in the left column (particularly memory & Tetris) for review. The right column (Cartoon story maker & portal maker) seem less stable and don't work well for me.