Werner Randelshofer has released version 4.1 of the Quaqua Look and Feel, "an extension for Apple's implementation of the Aqua Look for Swing. Quaqua aims at fixing inconsistencies between user interface elements implemented in Swing and those of native Mac OS X applications. To achieve this, Quaqua selectively replaces UI elements of Apples Aqua Look And Feel with elements of its own." Quaqua is dual licensed under the BSD license model and the LGPL. Java 1.3 or later and Mac OS X 10.4 or later are required. According to Randelshofer, "Version 4.1 is an experimental release, introducing a FileChooserUI in Leopard design...Except for window frames, panel backgrounds, and the UI-delegates directly used from Apple's Aqua Look and Feel, all other components are still rendered using the Tiger design. Version 4.1 can be run on top of the most excellent Java 6 Port "SoyLatte" by Landon Fuller."