What tools do you recommend to help other Website Developers?

This is a particular tough question. My background is in UNIX administration, and all my web and development work is performed using Firefox and Vi¹.

However I have come to rely on a few tools in particular, and found some others very usefull on occasion. All of these tools are browser based (and therefore cross-platform) and more importantly freely available. Please contact me if any are broken, shouldn’t be here or you have suggestions.

Standards Compliance

• HTML/XHTML Validator
  http://validator.w3.org/check
• CSS Validator
  http://jigsaw.w3.org/css-validator

Site Layout

• Browsershots - Auto Screenshots from multiple browsers
  http://browsershots.org

Search Engine Optimization

• SERP Checker and other Free SEO Tools from SEO Company
  http://www.seocompany.ca/tool/serp-checker.php

Spelling, Links etc.

• Site Check Spell Checker
  http://www.siteowner.com/sitecheck.cfm
• Link Validity Checker
  http://www.siteowner.com/system/linkcheck.asp