XML software

software tool for automating software build processes

document processor for the production and manipulation of large structured documents

A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the context of validating HTML, CSS, and XML documents like RSS feeds, though it can be used for any defined format or language.

XMLSpy is a proprietary XML editor and integrated development environment (IDE) developed by Altova. XMLSpy allows developers to create XML-based and Web services applications using technologies such as XML, JSON, XBRL, XML Schema, XSLT, XPath, XQuery, WSDL and SOAP.

XStream is a Java library to serialize objects to XML (or JSON) and back again.

category of projects at Apache