Galaxies is not your typical Game of Life software. While in most programms of that sort you can draw your own configurations and try them out, this application is more for observation, thought and aesthetic pleasure.
Basically, you get to lean back and watch a peculiar 2D universe evolve, live its busy life and die, listening to a droning ambient soundtrack, a distant signal from depths of space. Apart from watching, the program does allow you to interfere a bit, plus there are several curious modes which go beyond usual Game of Life simulations.
The program features a 30 minute soundtrack and is available for GNU/Linux, MacOS and Windows. Source code is available as well.