Niteo

Spider Blocker blocks most common bots that consume bandwidth and slow down your blog. 
It accomplishes this by using .htaccess file to minimize impact on your website. It’s hidden from external scanners.
Spider Blocker is specifically designed for Apache servers with mod_rewrite enabled, allowing you to effortlessly safeguard your website from the most prevalent bots that hamper performance and drain resources.
<h4>Plugin Features</h4>
<ul>
<li>Block Unlimited bots from viewing your site</li>
<li>Easy Export/Import rules (comes with most common list of bots)</li>
<li>Zero Footprint</li>
</ul>

Spider Blocker

Does what it promises to do. No more bad bots to my WP blog :)

Perfect!

SpiderBlocker will block most common bots that consume bandwidth and slow down your blog.

Dave Ligthart

Simple apache log parser for WordPress. Monitor site usage by ip-address. Adds a dashboard graph widget displaying the daily bandwidth usage.
If you have installed the WP-IP2Nation-Installer the stats will automatically include an extra “country” table column.
Download WP-IP2Nation-Installer here: https://wordpress.org/extend/plugins/wp-ip2nation-installer/

Spider Blocker vs WP-Alp