JGUI 3.0 is open source Java (TM) GUI library. It contains many useful components and utilities:

• actions (SelectableAction) and buttons (HtmlButton, ShapeButton etc.)
• color converter (Lab, YCC)
• ready to use drag and resize handlers
• event managers
• geometrie stuff (line, bezier)
• GMenu - extends JMenu with MenuItem group management.
• layout managers (RainLayout, BCLayout)
• renderers (ButtonRenderer), AffinePanel
• event managers (ActionManager, PropertyChangeManager etc.)
• resource embedding utility + embedded icons
• JShape - non-rectangular components (inclusive some predefined shapes)
• taskpane implementation (TaskPane)
• titlebar implementation (TitleBar)
• tooltip manager (TLToolTipManager, ImmediateToolTipManager)
• filetree implementation (browse files, ZIP archives, URLs etc.)
• miscellaneous components (ImagePanel, InputPopup, ScrollPaneNavigator) and utilities (DefaultAutoscrollHandler)