blq is described as 'Some organizations, such as the MAPS RBL and MAPS DUL, publish lists that identify potential sources of spam and email abuse. The blq utility is a Perl script that queries one or more of these lists to determine if a particular host is listed' and is a Anti-Spam tool in the development category. There are three alternatives to blq for a variety of platforms, including Mac, Windows, Linux, BSD and Haiku apps. The best blq alternative is Bad Behavior, which is both free and Open Source. Other great apps like blq are AbyssGuard and mod_httpbl.
Bad Behavior is designed to integrate into your PHP-based Web site, running as early as possible to throw out spam bots before they have the opportunity to vandalize your site with their junk, or even to scrape your pages for e-mail addresses and forms to fill out.
It’s a PHP script that stops bad robots, spammers and other unwanted entities before they can even load your website. It can be implemented in every website and it’s free! You just need access to your hosting and web server with php support. No databases needed.
The mod_httpbl Apache module is ideal for leveraging the Project Honey pot http:BL services within the context of an Apache web server. Built on the Apache APIs, the mod enables web admins to block comment spammers, harvesters, and other malicious IPs.