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OpenIntro isn't the only creator of free or open source products for statistics courses.

The resources here are a handful of many existing projects.

Collaborative Statistics (CNX.org)
CK-12 Probability and Statistics
Intro. Statistics (Missouri State)
Intro. to Statistical Thought (U. MA)
Concepts & Appl. of Inferential Stat. (Vassar)
Prob. and Stat. EBook (UCLA)
Introduction to Probability and Statistics Using R (R-Forge)
Statistics (Wikibooks.org)
Technology Innovations in Statistics Education
Journal of Statistics Education
Statistics Education Research Journal
ASA Education
CAUSE web
Rice Virtual Lab in Statistics
Statistics Online Computational Resource
RVLS Simulations and Demonstrations