Resources

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Link Checker

Xenu Links check (freeware program)
W3C Links checker (on line check)
WDC Link Valet (on line check)
Dead-links.com (on line check)

HTML/XHTML Validator

W3C Markup validation service (on line)
WDG HTML validator (on line) you can check all site
Page valet 4.2 (on line)
Alpine HTML doctor (on line)

CSS validator

W3C CSS validation service (on line)
WDG CSS check (on line)

WAI/508 validator

Cynthia says (on line)
Watchfire Bobby (on line)
WAVE 3.0 Accessibility Tool (on line)
Colorblind Web Page Filter (on line)

Free scripts

Hotscripts a large collection of free and commercial scripts

Other useful link

Web Page Analyzer (on line)