Google
Mass Keyword
Rank Checker

 

Allows you to check where a page ranks in Google for multiple keywords.
Spider Tester
Shows the page size, source code, meta tags, page title, textual copy of the page, keyword breakdown by density (including 2 and 3 word phrases), number of words, number of unique words, and outbound links on a page.
Common Terms
Keyword Rankings Tool

 

Shows where your page ranks for it's most common terms.
Keyword
 Density Analysis

 

Find common words and phrases density on your site.
Competition Manager Compare link popularity with your competitors' sites
Keywords
Activity & Suggestion

 

Offers suggested monthly regional search volumes by market for Google, Yahoo!, and MSN. Overture keyword suggestion tool, etc.
Online Browser