Zen2Seo

This plugin enables tracking spiders and bots via Google analytics without harc-coding your template files. Tracking bots and spiders on your website can help you understanding if all pages are visited by search engines or some of them have crawling problems. It is also useful to conduct SEO tests, if have not access to your server logs.
In order to make this plugin work, you need 2 thing:
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A new profile within your Google Analytics account. Select a “Add a Profile for a new domain”. Name it as you like (I suggest bots.mydomain.com). Take note of the Web Property ID (UA-XXXXXX-YY).
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The Google identifier of your domain, that’s the value of your _utma cookie on your website. Yo find this, use Mozilla Firefox (Tools>> Options>>> Show Cookies). Find your site, expand and look for the cookie named “_utma” (look at the first screenshot).
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Once you have this informations, you can install and activate the plugin.
For more information visit: <a href="http://www.giuseppepastore.com/en/portfolio/wp-bots-analytics-plugin/" title="SEO plugin" rel="nofollow ugc">WP Bots Analytics Plugin on Giuseppe Pastore’s site</a>

WP Bots Analytics

Enables tracking bots via google analytics on all pages.

Lukasz Jasinski

robots.txt is a file, which tell’s search engines, which parts of your site it can display publicly. 
This plugin add’s some entries to this file, to make your site safer from some attacks, keeping all your stength in seo intact ex. allowing search engine robots to harvest pictures for image search. When preparing a new site in WordPress, it’s one of the first plugins I install.

LJPL Armored robots.txt

Add some directives to your robots.txt file to keep your site safer

WP Bots Analytics vs LJPL Armored robots.txt