SpiderSquash analyzes client behavior and determines whether or not a client is a legitimate user or a malicious bot.
"Nonce, Please!" is a simple plugin that prevents brute-force comments and trackbacks from spammer. This is *NOT* an alternatives to Akismet.
Simple, but strong captcha, built to prevent spam in WordPress comments. One-click solution tested on many blogs!
A simple solution to misbehaving users.
Write on! is Getingate's Social Web Comment system that replaces your WordPress comment system with your comments hosted and powered by Getingate.
This plug is used to show hot searches in your blog.
Block Top Spammers displays a list of your top spammers' IP addresses. It also generates a blacklist for your .htaccess file.
Set time interval between comments.
AdCaptcher.com enables you to build custom captchas. You need an AdCaptcher account to administrate your custom captchas.
http:BL WordPress Plugin allows you to verify IP addresses of clients
connecting to your blog against the Project Honey Pot database.
Patterned after Dan Benjamin's Hivelogic enkoder, WP Emailcrypt keeps your email links safe automatically on-the-fly. No configuration.
NoFollow Free removes the "nofollow" tag from your WordPress blog's comments with a lot of custom options and provides the option to insert a "NoFollo
RSS link for this tag.