JAXB RI 2.2.5-4
Release Date: February 28, 2013
Download the binary and execute this jar as
java -jar JAXB2_20130228.jar
On Windows, you can just double-click the jar file to execute.
If you'd like to hack the source code starting from the final release version, download the workspace snapshot zip bundle. It contains all the CVS control files, making it ideal for submitting patches, checking diff, and etc.