Cheat Engine. A development environment focused on modding games and applications for personal use.
For the latest version:
For older versions, check out https://github.com/cheat-engine/cheat-engine/releases
The forum is up/down depending on DDoS attacks. In the chance it works, you can read posts at http://forum.cheatengine.org/
Alternate websites: http://reddit.com/r/cheatengine
http://fearlessrevolution.com/index.php
You can also follow cheat engine on twitter: https://twitter.com/_cheatengine
Download and install Lazarus version 1.6.4 from here
Run Lazarus and click on Project->Open Project. Select
cheatengine.lpi from the Cheat Engine folder as the project.
Click on Run->Build or use SHIFT+F9.
If you want to run or debug from the IDE on Windows you will need to start Lazarus as administrator.
If you wish to contribute, fork the repository on github. Create a branch for your changes. Lazarus likes to make changes to files just when you open them or move something around, so make sure you only stage the changes that are required for what you are trying to accomplish.
When you're done, push your branch to your personal fork. Finally go to the original Cheat Engine repository and create a pull request. Click on 'compare across forks' and select your fork as the head fork and your new branch.