Tools for web authors
- Web Developer Extension by Chris Pederick for Firefox and Chrome – http://chrispederick.com/work/web-developer/
- Firebug. Allows you to inspect, edit and monitor CSS, HTML, JavaScript and Net requests in any web page – http://getfirebug.com/
Lists of tools
- 21 top tools for responsive web design from .net magazine
- A neat list of accessibility tools and wizards from Accessify – http://accessify.com/tools-and-wizards/