need a good parser available for free

Can anyone provide information about all existing parsers (including free ones) and comparing them?
I am doing a little research for my group. I just barely know DOM and XML. Thanks a lot

Javasoft.com has a parser but I like the one at xml.apache.org the best. However, neither one really uses the DTD.
Many of the books on XML (like Rusty Harold's XML Bible) talk about free parsers like www.alphaworks.ibm.com/tech/xml, www.datachannel.com/xml_resources, www.loria.fr/projects/XSilfide/EN/sxp, www.cogsci.ed.ac.uk/%7Erichard/xml-check.html or www.stg.brown.edu/service/xmlvalid.
www.jclark.com might have a validating parser too.
Being lazy (and having a copy of IIS available) I like to do XSLT and apply DTD via a little ASP script as I compose my XML documents. By hitting F5 frequently on my browser, my server side XSLT not only does the formatting, but the DTD checking too. This way I know immediately if something is not right.
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What exactly do you mean by:
"Javasoft.com has a parser but I like the one at xml.apache.org the best. However, neither one really uses the DTD."
Both the JAXP package from Sun and the Xerces package from the Apache project provide validation by means of the DTD you supply. Supposedly they are both in full compliance with the appropriate standards on this.
Bill

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