FutrX

No More Bots is a simple yet effective solution for blocking bots and preventing spam submissions on your website. With No More Bots, you can select the pages that require protection and the plugin will automatically add a honeypot field to those pages to trap bots.
No More Bots is easy to use and highly customizable. You can set the Blocked Duration for blocked IPs and manage blocked IP addresses in the WordPress options table.

No More Bots

No More Bots is a WordPress plugin that allows users to select specific pages where they have submission forms (login, register, contact, etc.).

Denis V (Artprima)

AP HoneyPot WordPress Plugin, based on Jan Stępień’s http:BL, allows you 
to verify IP addresses of clients connecting to your blog against the Project 
Honey Pot database. Thanks to http:BL API you can quickly check whether your 
visitor is an email harvester, a comment spammer or any other malicious 
creature. Communication with verification server is done via DNS request 
mechanism, which makes the query and response even quicker. Now, thanks 
to AP HoneyPot WordPress Plugin any potentially harmful clients are denied 
from accessing your blog and therefore abusing it.
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AP HoneyPot WordPress Plugin

Hard to believe I've been using this fro over 3 years, and the previous one before for even longer. No I wonder this is still being maintained, but still using in the meantime. 

Updated 3 years ago and still works great

AP HoneyPot WordPress Plugin allows you to verify IP addresses of clients connecting to your blog against the Project Honey Pot database.

No More Bots vs AP HoneyPot WordPress Plugin