a. Backlink Checker – A list of sites that have linked to your blog or website. PageRank is largely determined by the number and quality of links to your site. Monitor this and you can probably guess what your PageRank ought to be.
b. Broken Link Checker – A look at which of the links in your site are pointing to incorrect or non-existent URLs. Having too many outdated and broken links on your web page may irritate not only the readers but the search spiders. Do this housekeeping once in a while to remove the bad links.
c. Google PageRank Checker – The Google PageRank of your site. You can also download Mozilla Firefox with Google Toolbar to view the Google PageRanks of all the sites that you visit.
d. Google PageRank Prediction – A future Google PageRank prediction. If you are dying to know, these sites can give you a fair estimate of your future PageRank.
e. HTML Optimizer – A clean up of your HTML source code. Be careful when you apply the suggested changes though. Always good to backup the template before making any modification.
f. Index Checker – Number of pages of your website that are indexed by search engines. If pages are missing from the index, try submitting your sitemap again.
g. Keyword Density Checker – The keyword distribution in your webpage. This will by and large influence the sort of Ads that AdSense will place on your site.
h. Keyword Suggestor – Suggested popular keywords for your website. Bear in mind these keywords when writing or editing your posts.
i. Meta-tags Generator – Configuration of website's meta-tags. Tailor a suitable description and set of keywords to be inserted into the template.
j. Reciprocal Link Checker – A check to see if the partners in your blogrolls or link exchange are linking to you.
k. Spider Simulator – The page contents as seen by a search engine spider. Some may give you a breakdown of the commonly used keywords in your site.