Top 17 Free Webmaster Tools
SEO Tools
backlink checker by 
This tool provided by iwebtools allows you to view a list of sites that link back to your website.
google banned by
This tool is also provided by iwebtools and this will let you know whether your website has been banned by google or not.
keyword density analyzer by 
This tool will analyze keywords and phrases on your website pages.
google pagerank predictor by
This tool will predict the pagerank of your site. This tool requires a minimum of 100 backlinks to accurately predict your pagerank.
google dance by 
This tool queries Google’s three main web servers and display the result in three frames on 1 page. Watch Google Dance.
site analysis including link popularity by 
This tool generates a report that includes information about number of backlinks, indexed pages, Google PageRank and whether your site is listed in search directories such as DMOZ and Yahoo.
SERPs position by
This tool queries three major search engines (google, msn, and yahoo) and reports your website’s position in each of those.
page strength by 
A very versatile tool that provides you with such information as position on google, age of a domain, Alexa rank, domain visibility and much more.
General Site Tools
speed test by
This tool checks how fast your website loads.
domain whois by
This handy tools allows you to get all the details (such as DNS settings, Registrar information, domain status, and etc.) about any domain name.
HTML and CSS Tools
HTML encrypter by
Use this tool to encrypt your html so that your html content will be hidden from others.
HTML optimizer by
Use this tool to clean your html pages by removing all the white spacing thus making your pages load faster.
Html Validator by 
Validate your pages, so that your site operates in conformance with W3C Recommendations and other standards, and more importantly displays predictable across all major browsers.
CSS Validator by
Use this tool to validate your CSS pages.
Miscellaneous
ip to location by
This tool will determine a location based on a provided IP Address. The beauty of this tool is that it is Ajax-capable, and it also provides you with a map of that location.
tiny url by TinyUrl.com
Make long URLs more usable so that they don’t break apart into multiple lines in your emails.
md5 Encrypt by
Use this tool to encrypt/encode your text into md5.
