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XQuery USE ME (XqUSEme)
A Firefox add-on that allows Xqueries in Firefox....
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....