AntiCheat development and support was discontinued September 7th, 2014. The previous page is archived here for reference purposes. Official downloads are still available for use as is the project source code. You must use these at your own risk as I can no longer vouch for their rate of success.
There's a "Reloaded" version of this project which has been updated for the newer versions and is under current development. You should give it a look if you're interested in continuing to use AntiCheat: http://dev.bukkit.org/bukkit-plugins/anticheatreloaded/
Thanks to everyone who has supported the AntiCheat project. Recently I have resigned my position as BukkitDev Team Lead and have decided to move on from Bukkit development. Unfortunately, this means that I will no longer be actively working on the AntiCheat source code, and as such I have decided to close the project.
Many thanks to JetBrains who have provided their IntelliJ IDE for development. Thanks to the many contributors to this project who's code helped do good in the community. Thanks to those of you who have provided your support in many different ways to the project: you know who you are, you made my life a lot better and I can't thank you enough for that. I am happy to say that this project has improved people's lives, and I couldn't have ever hoped to say more.