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LEGADEE (LEarning GAme DEsign Environment) is a free authoring environment that helps game designers and teachers design Learning Games that are fun and educational.
This open source environment was designed and developed in 2012, during Iza Marfisi-Schottman's doctorate at the LIRIS lab in France, directed by Franck Tarpin-Bernard and Sébastien George.
Seaweed is software to design and play economic-game experiments.
Seaweed can create simple two-player economic games with symmetric actions and one decision per screen. And your game is ready to be played by randomly paired people on the Internet.