Economics-games.com is a free educational games site for teaching microeconomics, industrial organization and game theory. This site includes some simple (short) simulations designed to demonstrate specific principles. This should not be confused with longer simulations that extend across many class sessions. Instructors set up user IDs & passwords for their class and students are paired with others in the class (or even across universities if desired). These are really nice interactive online exercises that can be done between classes. In this sense, they are an excellent online complement beyond the usual readings and talking head videos. Here are some of the games:

• Cournot and Stackelberg games
• Public good financing game
• Common-pool resources game
• Prisoner’s dilemma
• Asymmetric matching penny game
• An air transport economics simulation covering price discrimination, vertical differentiation and peak-load pricing.

In addition, you may wish to check out some of their longer, commercial games (http://aireconsim.com).
Contributed by Nicolas Gruyer