PentesterLab.com » The Exercises
January 18, 2013 at 12:02:44 AM GMT+1 - permalink - https://pentesterlab.com/exercises

bwapi - An API for interacting with Starcraft: Broodwar (1.16.1) - Google Project Hosting
January 18, 2013 at 12:00:52 AM GMT+1 - permalink - https://code.google.com/p/bwapi/

W3Challs : World Wide Web Challenges
January 17, 2013 at 11:59:55 PM GMT+1 - permalink - http://www.w3challs.com/

Hack This Site!
January 17, 2013 at 11:35:52 PM GMT+1 - permalink - http://www.hackthissite.org/

HackBBS
January 17, 2013 at 11:35:09 PM GMT+1 - permalink - http://hackbbs.org/index.php

Project Euler
January 17, 2013 at 11:18:16 PM GMT+1 - permalink - https://projecteuler.net/index.php?section=problems