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Validity
A Google Chrome extension that helps you validate the source code of the current webpage...
GooeySAX
GooeySAX - XHTML document validity checker...
TrueChecker
TrueChecker - Checks barcodes, BI, Euro, ISBN, NIB, NIF (Portugal)...
ISA Validator
Allows you to check the validity of ISA-Tab formatted experimental metadata....
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