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Sarissa is a cross-browser ECMAScript lib that helps with browser incompatibilities in XMLHttpRequest/XML/XSLT/XPath along with some bonus utility methods. People call some of this Ajax nowdays, but the term was not available back in early 2003 ;-)
Web browser form validator lib in Javascript 1.1. I wasn't satisfied with the libs I've found, so I've built mine. Deals with a lot of browsers, extensible and customizable. ERROR MESSAGES IN BRAZILIAN PORTUGUESE, but should be easy to change.