Online SEO tools

websitegrader.com

This one rocks! It generates a full report about your site. You enter its URL and after few seconds you get the report.
The report consists of three sections:

• On-Page SEO – metadata, heading and image summaries, interior page analysis
• Off-Page SEO – domain info, Google PageRank, number of Google indexed pages, last Google crawl date, traffic rank, inbound Links and checking presence in DMOZ, Yahoo!, ZoomInfo directories.
• Blogosphere – blog analysis and ranking, detecting recent articles, analysing social mediasphere, checking del.icio.us bookmarks and Digg submissions, RSS Feed avaiability, conversion form, competitive intelligence, keyword grader, and more.

There are automatically generated hints and descriptions according to the results that will help you fix your website.
http://www.websitegrader.com/

linkvendor.com

This is also wonderful set of tools. According to the site, you can do the following:

• Alexa rank traffic Challenge for 3 domains.
• Find and detect cloaked content on a website.
• Validation of meta tags with Google recommendations.
• Check the PageRank on different Google data centers.
• Check the PageRank for up to 5 different URLs.
• Compare two domains after SEO principles.
• Check the number of social bookmark links to a website.
• See what webcrawlers and spiders see.
• See the PageRanks of linked pages in the website overlay.
• Check how long a website take to load.
• Check the keyword density and detect the most frequent Keyword.
• Check search result positions of a domain for several Keywords.
• Check the age of a domain with several Waybackmachines.
• Find all Backlinks of a domain including host IP and Google PageRank.
• Find all domains from from an unique ip adress.
• Check the number of indexed pages and backlinks.
• Validate the price of a textlink on a website.
• Link analysis of external and internal links with associated anchor texts.
• Generate search engine friendly meta tags in seconds.
• Create your own XML Sitemap in seconds.
• Convert text with personal information into a image.
• Convert any date in the unix timestamp format.
• Create URL Rewrite rules for apache.

http://www.linkvendor.com/

clicktale.com

Record visitors’ every action as they browse your website. Watch movies to understand visitor behavior, gain valuable insights and improve your website’s usability.

http://www.clicktale.com/

Keyword Density Checker

Just enter URL for website to analyze.

http://www.iwebtool.com/keyword_density