PhET Interactive Simulations (Science and Math)

[CadetStimpy]

Well, I suppose they're not exactly games, but sorta. PhET provides fun, free, interactive, research-based, science and mathematics simulations. PhET was originally for Physics Education Technology, but now encompasses other sciences and mathematics. The simulations range from Elementary School through University level. The sims are either HTML5, Flash, or Java. Anyway, click here to see the full list, but here's some of them:

[akumar]

PhET has grown over the years, and now covers a broad range of science and math. Another resource for science simulations is SimPop. It largely covers middle and high school science topics. Disclosure: I teach coding to high school students who are developing these simulations.