Textbooks (exclusively)

• OpenStax Textbooks

• American Institute of Mathematics Approved Open Textbooks

• College Open Textbooks

• 2012 Book Archive
  

Learning Objects and Textbooks

• OER Commons

• BC Campus (open textbooks and more)

• OpenStax/Connexions Learning Objects

• Content Without Borders

• NJVID Digital Video Repository (New Jersey's video repository)

• National Science Foundation (NSF) MultimediaGallery

• The Orange Grove (Florida State's repository portal)

• Kahn Academy

• MERLOT II
  

• OpenCulture.com (Free cultural and educational media resources)

• SCRATCH (MIT's educational repository)

• Open Access Theses and Dissertations

• PhET: interactive simulations for science and math

Primarily Video

• Academic Earth