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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....
Markup
An intuitive HTML character escape and color picking tool....
Magic Markup
Simple text annotation utility...
document markup annotate annotate document document annotator
Color Markup
Color Markup - Auto tracking in InDesign CS...
Code Markup-er
A free Adium script that will help you format a text with a fixed-width font...
RapidWeaver Markup Plugin
Open source Markup plugin for RapidWeaver...
Rapidweaver markup plug-in RapidWeaver plug-in markup plug-in
Validate Page Markup
Free AppleScript for Camino that sends the current page to the W3C markup validation service...
Page validator
Page validator - Firefox add-on that validates the current webpage using W3C website validation service....