The most advanced protection against sploggers and spam users registration, is fully WordPress,WordPress MU ,BuddyPress and bbPress 2.0 compatible
LionScripts' IP Blocker for WordPress allows you to stop the Spam Visitors and malicious IP Addresses. You can block IP addresses by using the ma
IPBlock offers powerful protection against bruteforce login attacks. Works in 2 modes, allowing you to set your own blocking scheme.
ipBlockList.com is a community and server based blocklist that is constantly updated with the help of user submission and web server iptable reports.
jDefender WordPress security plugin designed to protect and secure your website, so you can focus on your customer with peace of mind.