Free Online Tools with a short description.

Browser Shots
Check the compatibility of your web design on different operating systems and browsers.
DEV Mechanic
Webmaster Tools, Developer Tools, Programming Tools en Tips.
Colorscheme Designer
Choose a color and this tool will generate a matching color pallet, including primary and complementary colors. The results you can save as HTML-CSS, XML, ACO, GPL of TXT.
Favicon Generator   +   Genfavicon
Create a favicon for your site and save it as an .ico file, more info about favicons on Wiki.
Google URL Shortener also allows you to track the clicks and referrers on any shortened URL in real-time.
Grid Designer
Generate the layout for your blog or website, adjust the amount of columns and width etc. and save it as XHTML en CSS.