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World Possible
PhET Interactive Simulations (es) - Kolibri

Spanish < 0.1 GB (CC BY 4.0)
The PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations that engage students through an intuitive, game-like environment where students learn through exploration and discovery.
Download Options

Zip File over the web
Zip File over FTP (host: dev.worldpossible.org user/pass: anonymous)
Copy & paste the above command to any Unix-based system to begin download. Rsync can pick up where it left off and only downloads changes. It's the most efficient way to stay up-to-date with OER2Go modules.
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