Search Engine Tracker. Check to see of you are listed on up to 4 Engines for any given Search Term - Free Sample.
Great Article on Search Engine Optimization By Net Mechanic writer Christine Churchill.
For a great article on Link Popularity by Larisa Thomason for Net Mechanic. Some of the information is dated though since Yahoo is now in the process of leaving Google for Search Results. It is always changing...
Net Mechanic Products Available for Purchase also. The free Samples are somewhat limited as to how many pages or how many times you can use them. Add them to your favorites and check your site regularly. Buy them if you want full access, 24/7. I've used them and they are very good.
Free Link Popularity Checker. Works for Lycos/All The Web, MSN and Alta Vista Engines. You can list 4 different URL's to track versions of your own URL (with and without the www.) or compare your site with competitor’s sites. It can be a onetime use or emailed every week to you. I have 3 reports sent every week for my sites.
Exact Seek.com has this Site Ranker as a free tool with a search term's results. Just put in your site URL and the search term/word and it will give you the results from the Exactseek data base.
Need help with HTML? Lissa Explains it All is a great site geared for kids so its not too hard for adults either. I use Lissa for HTML Help all the time and my son has designed many sites with her tips and suggestions.
Lissa has an Image Cruncher Available thru Lissa Explains It for both GIF and JPEG's.
The bigger sites that have free tools - Go straight to the source.