Freebies
— Books —
2012 Book Archive - (mostly) entry-level college textbooks with a Creative Commons license
Free e-book! - monthly free releases from University of Chicago Press
punctum books - independent, open access, para-academic publishing group that's also queer- and scholar-led
— Courses —
Coursera - lots of free MOOCs (with optional paid certificates)
MIT OpenCourseWare - free teaching and learning materials from MIT courses
Open Culture - more lectures, courses, etc. for autodidacts
Open Yale Courses - introductory course lectures from Yale University
ROAM - like MIT OpenCourseWare, but from Pennsylvania State University