Cheat Engine

Cheat Engine is an open source tool designed to help you with modifying single player games running under windows so you can make them harder or easier depending on your preference(e.g: Find that 100hp is too easy, try playing a game with a max of 1 HP), but also contains other useful tools to help debugging games and even normal applications.

GroundZero's Account Freezer V1.0

Features:
Let's you freeze Facebook, Windows Live, and YouTube accounts. Coming soon are MySpace and AIM too, the code is there it's just that the page loading is funky.

Honeyd

Honeyd is a small daemon that creates virtual hosts on a network. The hosts can be configured to run arbitrary services, and their TCP personality can be adapted so that they appear to be running certain versions of operating systems. Honeyd enables a single host to claim multiple addresses on a LAN for network simulation. It is possible to ping the virtual machines, or to traceroute them. Any type of service on the virtual machine can be simulated according to a simple configuration file. It is also possible to proxy services to another machine rather than simulating them. It has many library dependencies, which can make compiling/installing Honeyd difficult.

HijackThis

HijackThis inspects a computer’s browser and operating system settings to generate a log file of its current state. It can selectively remove unwanted settings and files. Its main focus is on web browser hijacking. It is a freeware utility originally written by Merijn Bellekom but now distributed by Trend Micro.

WebGoat

WebGoat is a deliberately insecure J2EE web application maintained by OWASP designed to teach web application security lessons. In each lesson, users must demonstrate their understanding of a security issue by exploiting a real vulnerability in the WebGoat application. For example, in one of the lessons the user must use SQL injection to steal fake credit card numbers. The application is a realistic teaching environment, providing users with hints and code to further explain the lesson.