The DITA Open Toolkit is an implementation of the OASIS DITA XML Specification. The Toolkit transforms DITA content into many deliverable formats. See http://dita-ot.sourceforge.net/ for documentation and links to downloads.
The source code and issue trackers have been moved to https://github.com/dita-ot/dita-ot
Overly complicated, clunky and inaccessible. With some years in Java and XML experience , and then some years with techcomms, I couldn't get dita going at all after a few days of trying. All ant based scripts for demos reported errors and calling JavaInvoker woudn't work. Looking at the source reveals hardcoded paths and parameters inJavaInvoker. Documentation utterly unhelpful for beginners.