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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....
Override Compatibility
Firefox add-on that eliminates the compatibility checker about extensions and themes....
Firefox extension checker tester compatibility compatibility checker
Compatibility Update for QuickTime
Provides increased compatibility with iChat....
iLife QuickTime compatibility compatibility update QuickTime update
Add-on Compatibility Reporter
Enables you to check whether your favorite add-ons get updated for upcoming Firefox releases...
check release update checker compatibility compatibility checker
Compatibility Update for QuickTime 7.5.5
Provides increased compatibility with iChat....
iLife QuickTime compatibility compatibility update QuickTime update
Add-on Compatibility Reporter for Thunderbird
An add-on that enables you to check if a given add-on is compatible with your current Thunderbird version...
check verify add-on compatibility checker check compatibility
Digital Camera RAW Compatibility Update
Extends RAW file compatibility for Aperture 2 and iPhoto '08....
camera compatibility RAW raw compatibility Aperture compatibility
Graphics Firmware Update compatibility with Windows 7
Provides support if you run Windows 7 using Boot Camp on your iMac or Mac Pro....
graphics update firmware firmware update Windows 7 compatibility
Apple Compatibility Update for QuickTime 7.5.5 for Mac
Improve QuickTime compatibility with iChat....
RapidXml
RapidXml is an attempt to create the fastest XML parser possible, while retaining useability and reasonable W3C compatibility...
Mobile Toolkit
Google Chrome extension that provides code validation tools and free resources for mobile web developers...