Site Valet : Web Tools for Quality, Accessibility, Standards Compliance.
SQL Fiddle : A tool for easy online testing and sharing of database problems and their solutions.
rsizr : rsizr is a Flash application that lets you resize JPG, PNG, and GIF images on your computer. With rsizr, in addition to normal image rescaling and cro...
W3C Link Checker : Check links and anchors in Web pages or full Web sites
RegPack : RegPack is a packer intended for use on minified Javascript code.
It is mostly suited to small size constraints (1kb, up to 4kb).