Python Crash Course
Eric Matthes
How Fascism Works: The Politics of Us and Them
Jason Stanley
Music Theory for Musicians and Normal People
Toby W. Rush
The Happiest Days of Our Lives
Wil Wheaton
Open Data Structures (in pseudocode)
Pat Morin
Open Data Structures (in Java)
Open Data Structures (in C++)
The Imposter's Handbook
Rob Conery
Algorithms
Jeff Erickson