Many books on Unix, X-Windows, and the Internet can be found in the U of T bookstore. Books on many packages, such as Maple and SAS, are also available there. Copies of some of these books are in the graduate student office, where they are supposed to remain.
A collection of manuals for S, SAS, and some other statistical packages are available in at Statistical Consulting Service, Sidney Smith room 6008. These can be used for reference, or borrowed for a brief period (if you get permission first).