Every web developer/design relies on a great set of tools to get their work done, and I mean more than just Adobe products. The Internet is choc’ full of excellent tools. Here are some of the tools I use on a daily basis. If I miss anything amazing please add it in the comments.
Firefox Plugins
First off, Firefox is a must for any developer. The plugins can be beat.
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
Adds a menu and a toolbar with various web developer tools. Awesome tools. I love the CSS tools as well as the form tools and the view port resizer. Really helpful.
Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies.
Draw out a ruler to get the pixel width and height of any elements on a web page.
Allows you to embed Internet Explorer in tabs of Mozilla/Firefox or switch your current window back and forth between usinging the firefox rendering engine and the ie rendering engine. It may not replace testing in ie but is a great tool for quick on the spot testing.
YSlow analyzes web pages and tells you why they’re slow based on Yahoo’s rules for high performance web sites.
Internet Resources
Here are some web sitesi keep on hand and ready for action.
Whether you just want to browse our huge image gallery or want to share your personal photos with others, this is the site for you!
Browse color schemes, find inspiration.
At W3Schools you will find all the Web-building tutorials you need, from basic HTML and XHTML to advanced XML, SQL, Database, Multimedia and WAP.
Blogs
Some helpful and interesting blogs that cover web development from design & code to entrepreneurial tips.
A List Apart explores the design, development, and meaning of web content, with a special focus on web standards and best practices.
Vitamin is a resource for web designers, developers and entrepreneurs.
This is just a start. There are tons of other resources out there. These are just a few of my favorites. If you have any others or suggestions please add them in the comments.