MockupScreens helps you to sketch screen mockups of your application and organize them in scenarios. With MockupScreens you can experiment interactively with your clients, and quickly create wireframe of your application, while the coding hasn't even started yet. MockupScreens main design goals are ease of use and productivity.
GRANDTOUR creates accurate wireframe scenes from Voyager or Giotto spacecraft, and from space or Earth (spacecraft visible). User has considerable control over time, field, etc., and many frames/second are generated. Developed at JPL to assist in analysis of science and optical navigation data, it was also filmed by the BBC/NOVA for a Voyager documentary. Conveniently runs from any Windows/DOS.