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Validate at W3C
Validate at W3C - Contextual menu item in Opera to submit the current page to the W3C's HTML validator...
W3C Tool Kit
W3C Tool Kit - Fast access to W3C Markup and CSS Validator...
W3C (X)HTML Validation
A Firefox add-on that provides you quick access to a W3C markup validation service...
W3C HTML Batch Validator
A free Python script that will call the W3C HTML Validator in batch mode...
W3C Offline Page validator
Firefox add-on that allows you to validate pages using W3C Markup validation service....
Offline Page validator
Offline Page validator - Firefox add-on that helps you submit the current page to the W3C validation tool....
rel Links
Firefox add-on that allows you to access links containing a rel attribute....
Mozilla XForms
Firefox add-on that is the new online form standard....
XQuery USE ME (XqUSEme)
A Firefox add-on that allows Xqueries in Firefox....
XML Digital Signature Tool
A Firefox add-on that helps you process Digital Signature in XML documents....
Chiba
An open source Java implementation of the W3C XForms standard...
Web Log Analyzer
Helps you analyze Apache and W3C log files...