This site has hundreds, if not thousands, of free e-books on a wide range of topics:

http://www.freebookcentre.net/

In addition to hundreds of math e-books on topics such as **Linear Algebra**, **Geometry**, **Applied Mathematics**, and **Probability Theory**, there are also selections of free books on many **Computer Science** topics, **Chemistry, Physics**, **Languages**, and much more!

*Click here to see more in Resources.*