"When did the copyright holders become the Corporations? Who owns the Intellectual Property? Who controls our Arts and Sciences? They are slowly eroding our rights. The authors, scientists, researchers, students and you are very much at risk."
by Brad Miller and David Ranum, Luther College (as remixed by Jeffrey Elkner)
by Mark Guzdial and Barbara Ericson
Hands-on introductory computer programming using Python 3.
by Peter Wentworth, Jeffrey Elkner, Allen Downey, and Chris Meyers
An introductory computer science text book using Python.
by Tony R. Kuphaldt
A free series of textbooks on the subjects of electricity and electronics