Besides the usual small fixes and improvements, the major new feature is a built-in wiki! See [WikiDocumentation] for more information on that, and [NewFeatures230] for the full release notes.
You can find it in the download area. It comes complete with a ready-to-run Jetty container for quickly getting up and running (start.bat/start.sh for starting the server, stop.bat/stop.sh for stopping it) on port 8888. The war file (in the webapps directory) can be used in any other servlet container (like Tomcat) as well.
Updating is fairly easy, as database changes are now applied automatically rather than having to be done manually.
Wiki: NewFeatures230
Wiki: WikiDocumentation