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SeoQuake

http://www.seoquake.com/ SEOquake parameters Users can create their own parameters for SEOquake . In order to do so: open SEOquake preferences, switch to bookmark Parameters, press the button New and fill required fields.
http://litmus.com/ Litmus is the perfect complement to your email marketing program. As an independent company, our tools are compatible with any email provider, so there's no need to switch.

Litmus

https://developer.mozilla.org/en/CSS_Reference

Developer Center CSS Reference

lists all standard CSS properties, pseudo-classes and pseudo-elements , @-rules , and selectors in the alphabetic order.
What is Selenium? Selenium automates browsers . http://seleniumhq.org/

SeleniumHQ

FireShot

FireShot is an extension for Firefox, Internet Explorer, Chrome, Seamonkey and Thunderbird that captures, edits, annotates, organizes, exports, uploads and prints screenshots of your web pages. Press PrintScreen and can't grab the entire webpage because it is longer than the browser window? http://screenshot-program.com/fireshot/
http://kmeleon.sourceforge.net/

K-Meleon

K-Meleon is an extremely fast, customizable, lightweight web browser based on the Gecko layout engine developed by Mozilla which is also used by Firefox . K-Meleon is Free , Open Source software released under the GNU General Public License and is designed specifically for Microsoft Windows (Win32) operating systems.
Have you ever saved captured screenshot to disk, opened e-mail or FTP client or web browser to upload it onto public server to obtain opportunity to get a link and distribute it? http://screenshot-program.com/

Screenshot