1)   Gravit 0.4.2
Gravit is a gravity simulator which runs under Linux, Windows and Mac OS X. It uses Newtonian physics. Although the main goal of Gravit is to be as accurate as possible, it also creates beautiful looking gravity patterns.

 2)   Geo Gizmo 3D Screensaver 1.0
Geo Gizmo is a pollution-free nanodevice that acts as a perpetual-motion machine to generate electricity from artificial gravitons in motion above a quantum energy plate, without any loss of kinetic energy.