Open learn (ou courses for free)

[lincs_b]

On this page are loads of e-books from open university courses. They range from the really basic to some final year materials.

http://openlearn.open.ac.uk/course/index.php

All of the science courses begin with the letter s in the code and maths m, but some of the other stuff is interesting too.

[zyh]

Great site, there are a lot of free ebooks there, and covers almost every categories. It's like a wikibook.

[AFG34]

thanks for sharing!