CirclePack: free software for circle packing, created and copyrighted by Ken Stephenson.
(Caution: "Circle packing" is NOT just 2D "sphere packing"!!)

• About CirclePack: background and version log.
  
• Downloading all Java version 5.0.
• Prepared Scripts (single click execution)
• packings
  

Screen Shot: (Note also that tooltips will display with most windows, buttons, and icons.)