Great collection of Serious Games for Education. STEM, Math, all ages. Home of Lure of the Labyrinth.
Games Resource
Links to games - resource
Game and links to company's other simulations - I have not reviewed.
Language Arts, Math, Science - excellent - Kids always love this. Challenging
Has lots of options for storytelling - movies, drawing, pictures, creating a stories. Not a game - but feels like one.
Now also included in Brain Pop Game Up - Excellent
Great Games Information - resource
How to design your own games - resource