xmlroff is a fast, free, high-quality, multi-platform XSL formatter that aims to excel at DocBook formatting and that integrates easily with other programs and with scripting languages.
The main goal of the Office Binary (doc, xls, ppt) Translator to Open XML project is to create software tools, plus guidance, showing how a document written using the Binary Formats (doc, xls, ppt) can be translated into the Office Open XML format. As a result customers can use these tools to migrate from the binary formats to Office Open XML Format thus enabling them to more easily access their existing content in the new world of XML. The Translator will be available under the open source Berkeley Software Distribution (BSD) license, which allows that anyone can use the mapping, submit bugs and feedback, or contribute to the project.
The Dublin Core Metadata Initiative is an open organization engaged in the development of interoperable online metadata standards that support a broad range of purposes and business models.
MagpieRSS provides an XML-based (expat) RSS parser in PHP.
MagpieRSS is compatible with RSS 0.9 through RSS 1.0. Also parses RSS 1.0's modules, RSS 2.0, and Atom. (with a few exceptions).
eXist is an Open Source native XML database featuring efficient, index-based XQuery processing, automatic indexing, extensions for full-text search, XUpdate support, XQuery update extensions and tight integration with existing XML development tools. The database implements the current XQuery 1.0 working drafts, with exception of the schema import and schema validation features defined as optional in the XQuery specification.