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List of freely available programming books - Stack Overflow
stackoverflow.com · · Page
O'Reilly's bookshelf: Reference Library
hell.org.ua · · Page
Algorithms
cse.ucsd.edu · · Page
by S. Dasgupta, C.H. Papadimitriou, and U.V. Vazirani
Mathematical Illustrations: A Manual of Geometry and Postscript ( Cambridge Press ) by Bill Casselman
math.ubc.ca · · Page
Postscript is very cool. wish I had discovered it when I was trying to draw pictures using BASIC or C-Graphics :)
O'Reilly Open Books Project
oreilly.com · · Page
O'Reilly has published a number of Open Books--books with various forms of "open" copyright--over the years.
loads of programming ebooks
lab.lpicn.org · · Page
oreilly etc..