Keypic checks your comments against the Keypic Web Service to see if they look like spam or not.
Keypic checks your forms against the Keypic Web Service to see if they look like spam or not and lets you review the spam it catches under your blog's "Comments" admin screen. Keypic protect also your login form from brute force dictionary attachs, your registration form from unwanted spammers and generally all the forms you can imagine :) If you want a complete free antispam solution, you don't want to install CAPTCHAs plugins and so on, this is the right choice. Is also possible look at live installation at http://wordpress.keypic.com/
Major new features in Keypic 1.0 include:
PS: You'll need an Keypic FormID to get improved functionality. Keys are free for every kind of use (It's free and will always be.)