Oracle has opened up the JavaFX UI Sandbox repository on OpenJFX as announced on the fxExperience blog. Controls in the OpenJFX repository might eventually be included in a next JavaFX release.
This GitHub project provides simple jar files for some of those sandbox controls.
JavaFX Dialogs are simple dialogs in the style of JOptionPane from Swing.
Details about JavaFX Dialogs
Marco Jakob (http://edu.makery.ch)