Budiony Damyanov

Counts the visits from web spiders, crawlers and bots in your blog, with ability to get the blog rankings from Google or Alexa. 
Also can count any other visit, the plug-in is looking for patterns in user-agent string, which pattern can be customized. 
You can block or unblock crawler, spider (or any other item), by IP address and identifier via .htaccess file. 
As additional information you can get your blog rankings from Google PageRank or Alexa.

bodi0`s Bots visits counter

Counts the visits from web spiders, crawlers and bots in your blog, with ability to get the blog rankings.

Vicente Ruiz Gálvez

This plugin has been removed and is no longer updated.
Many thanks to all who have helped me, and I have been given support throughout the time that the plugin has been kept active.

VR-Visitas (hits counter stats)

This plugin has been removed and is no longer updated.

bodi0`s Bots visits counter vs VR-Visitas (hits counter stats)