Extension:AntiBot

AntiBot is a simple framework for spambot checks and trigger payloads. The aim is to allow for private development and limited collaboration on filters for common spam tools such as XRumer. (XRumer is actively maintained to keep up to date with the latest antispam measures in forum, blog and wiki software.) I don't want to make it easy for spam tools developers by giving them our source code.

Download
You may also want to download (or write) some additional plugins.

Installation
To install, put this in LocalSettings.php:

And then copy the plugins you want, from the available directory into the active directory.