Here is a non-exhaustive list of some links to useful tools in computer science domain:
A collection of open source tools: http://www.onlinecollege.org/2009/01/22/free-or-open-source-tools-for-students/
One of the best speech recognition engines: http://www.speech.cs.cmu.edu/
Make nice presentation using Beamer (in French): http://germain-vallverdu.developpez.com/tutoriels/latex/beamer/1erbeamer/
Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (Partially Mathcad-enabled): http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=528
Latex templates for scientific papers, books, CV, cover letters and so on: http://www.latextemplates.com
Help on latex including tikz, beamer and so on: http://tex.stackexchange.com
E-book for making nice TikZ graphics: http://ftp.oleane.net/pub/CTAN/graphics/pgf/base/doc/generic/pgf/pgfmanual.pdf
...(to be completed)