A lot of the tools that you need to carry out Search Engine Optimisation for your website are freely available on the internet. There are some many out there, which ones are the best and worth spending you time using.

Well I recommend the ones that are available at www.seomoz.org they have both free (registration required) and member only tools, the free ones are listed below:

1. Strongest Pages on my Domain - this tool with list your website pages that have best oportunity to rank highest in search engines.
2. Who else is hosted on my IP - this tool will list all the other websites that are hosted on the same IP address.
3. Check Inclusion - this tool will check to see if your site is listed within Google, Yahoo and MSN
4. Check Backlinks