The application lies within Theming Tools, more precisely Screensavers.
From the developer:
TriVectus Gravity is a chaotic, scientifically inspired screen saver created in OpenGL. At its heart is a collection of planets that exist in a miniature universe. Each planet has mass and velocity, and is affected by gravitational forces from all of the other planets. Eventually, the planets will collide, the victors gaining mass in the destruction of others.
You may want to check out more Mac applications, such as Gravity Guy, Gravity Lab or Finger Gravity, which might be related to TriVectus Gravity.
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