In an effort to make the curricula of Euler Circle classes available to a wider audience, I am slowly preparing a series of textbooks based on the classes I have taught.
My first book, on cryptography based on our winter 2016 Euler Circle class, has been published by Springer. You can also find it here on Amazon (affiliate link).
My second book, on algebraic topology based on classes I and other people have taught at the Stanford University Mathematics Camp, has also been published by Springer. You can also find it here on Amazon (affiliate link). This book is coauthored with Clark Bray and Adrian Butscher.
We plan to produce books based on other classes in the future.