It looks like Werner Randelshofer's fine Quaqua Look-and-feel for Java Swing over Mac OS X has been orphaned for Mavericks. Is there any alternative or forked effort to continue updates, especially for the JFileChooser replacement?
There is a fork of the project which does support Mavericks: https://github.com/karlvr/Quaqua
By "support", I simply mean that it doesn't explode when you try to use it. The file chooser does work. Most other custom UIs still work, but (AFAIK) have not been updated at all.