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Display Webpages in Tabs
Displays webpages in Safari, using multiple tabs if the user has enabled this option...
Validate Me
Validate Me - Validation for HTML, CSS, XHTML based on W3C standards...
Validate at W3C
Validate at W3C - Contextual menu item in Opera to submit the current page to the W3C's HTML validator...
Validate Page Markup
Free AppleScript for Camino that sends the current page to the W3C markup validation service...
Validate Page Links
Free Camino script that will allow you to send the active page's URL to the W3C link checker...
ODK Validate 1.2.3 for ODK Collect v1.2
Verifies if your XForms are OpenRosa compliant...
Safari Tidy Plugin
Validate webpages you browse for (X)HTML compliance...