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W3C (X)HTML Validation
A Firefox add-on that provides you quick access to a W3C markup validation service...
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 Offline Page validator
Firefox add-on that allows you to validate pages using W3C Markup validation service....
W3C HTML Batch Validator
A free Python script that will call the W3C HTML Validator in batch mode...
Simple Validation
Library for retrofitting UI validation to swing applications...
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GWT Validation Library
Validation library for the Google Web Toolkit...
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GWT Validation Framework
GWT Validation Framework based on the JSR-303...
NRG Address Validation
NRG Address Validation provides integrated address management inside of FileMaker Pro...
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Java Validation Framework
Java based validation framework...
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Page validator
Page validator - Firefox add-on that validates the current webpage using W3C website validation service....
Offline Page validator
Offline Page validator - Firefox add-on that helps you submit the current page to the W3C validation tool....