http://smashthestack.org
Вкратце: набор игр для Ъ-хакиров. Например,
http://logic.smashthestack.org:88/
Game Information
Welcome to the Logic Wargame at the SmashTheStack. This game consists of many different challenges ranging from buffer overflows, format string vulns, assembly challenges, network forensics, vulnerable web applications, heap attacks and more.