Swing Java docking framework

 FlexDock is a Java docking framework for use in cross-platform Swing
 applications. It offers features you'd expect in any desktop docking
 framework such as:
  * Tabbed and Split Layouts
  * Drag-n-Drop capability
  * Floating windows
  * Collapsible Containers to Save Real Estate
  * Layout Persistence
  * Multi-plaform (fully testing on Microsoft Windows, many WM of GNU/Linux,
    Mac OS X, OpenSolaris, etc)
  * No JNI