The DITA Open Toolkit is an implementation of the OASIS DITA XML Specification. The Toolkit transforms DITA content into many deliverable formats. See https://www.dita-ot.org/ for documentation and links to downloads.
The source code and issue trackers have been moved to https://github.com/dita-ot/dita-ot
Orangevolt EclipseXSLT provides XSLT support to the Eclipse platform. It is the Eclipse based successor of the java/swing based ROXES XmlWrite XSLT editing environment. It provides many great enhancements when working with XML/XSLT