Download of Gravilux 2.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This Mac application was originally created by Scott Snibbe. Gravilux for Mac belongs to Lifestyle Tools.
From the developer:
Gravilux is a combination of drawing, animation, art, science, and gaming.
With each touch in Gravilux, you exert a gravitational pull on a world of simulated stars.
You can tease and twist the particles into galaxies, explode them like a supernova, or color the stars by their speed. You can change parameters including gravity, antigravity, number of stars, star size, and color.
You may want to check out more software for Mac, such as Murasaki - EPUB Reader, TwitCasting Alerts or iMeme, which might be related to Gravilux.