Links

Mathematics

• MathOverflow: A site where mathematicians can ask questions of interest to other mathematicians
• Dover Mathematics Books: Good publisher of many books at a low price
• Putnam Problems: The questions to the past Putnam examinations, with solutions to about half of them
• Mathematical Quotation Server: Words from the masters, and other interesting gems
• Mathworld: A good online encyclopedia of mathematical topics
• The Integrator: A powerful integration software using Mathematica's engine
• MathSciNet: The AMS database for reviews of mathematical papers and books.

Resources For Students And Academics

• UCI Machine Learning Repository: Real data that anyone can use.
• ABE Books: Good for international editions of some math books, which are much cheaper than the average bookstore
• SpringerLink: Contains full books for participating institutions. Many good mathematical textbooks can be found here, as well as those on biology, social science, computer science, and physics.
• Lead2Amazon: Get a BiBTeX entry for that book you're referring to in your paper without having to type! Yay!

Other Interesting Sites

• University of Ottawa: This is where I got my B.Sc. Honours Mathematics degree.
• McGill University: This is where I am going for graduate studies
• Michal Polak: The website of my uncle. He's a professor of evolutionary ecology at the University of Cincinatti.

Humour

• Rejecta Mathematica: A journal that publishes rejected papers.
• Dihydrogen Monoxide FAQ: Yes, this is dangerous stuff.

Health

• Nutrition Data: Data on a large number of foods.

Open Source (Linux)

• Ubuntu: My operating system of choice.
• Fluxbox: The window manager I use for Linux. Everything I want and nothing I don't!
• BashFAQ: This is a very useful set of tips for Bash
• DownThemAll: An extremely handy Firefox extension that allows you to download mutliple files with a single click or small set of clicks. It's great for downloading course notes, for instance.
• Inkscape: An awesome drawing program that is intuitive to use, and has advanced features like manual font kerning. I used this program to design the graphics for jpolak.org.
• Valgrind: A memory-leak detector for C and C++ programs. This is the tool to use to detect those memory leaks in large programs.
• GCC: The GNU Compiler Collection. This is a more behind-the-scenes type program but it deserves a mention, seeing as I use it for all my projects and it does a wonderful job
• R: What I use for statistics and other random (haha) computations
• EncFS: An encrypted filesystem using FUSE. Perfect for quickly encrypting content, as long as you don't mind leaving evidence that something is encrypted
• Claws Mail: The email client I use. Claws has external editor support, and there is also a Windows Port (never tried the port)
• Vim: The ultimate text editor, better than emacs ;)
• Octave: A fairly good open source Matlab replacement.
• Inkscape: For drawing vector art.
• git: A quick version control system with easy branching.
• AdBlock Plus: Get rid of internet advertisements.