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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....
To Do Checker
An easy to use application to manage your notes....
Domain Checker
Domain Checker - Checks if a domain is registered or not...
Location Checker
Automatically set your default printer and network settings up...
PageRank Checker
Check any website's page rank with a click of a button...
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Geburtstags Checker
Birthday organizer and notifier...
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Unicode Checker
Explore and convert Unicode...
Wii Checker
Wii Checker - check Amazon for Nintendo Wii availability...
Acronym Checker
Checks an acronym for validity and gives it a purity rating...
Skip Checker
Fun with your Mac's Sudden Motion Sensor...
MD-5 Checker
Creates and checks MD5 checksums...
Secrets Checker
Manage a hierarchical list of text entries which can be saved and encrypted...
Preference Checker
Preference Checker - Free Mac application based on the Unix command plutil...
iTunes Checker
Software to check the consistency of an iTunes library...
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