Stellarium 0.11.1 - Open source desktop planetarium.. (Free): "
Stellarium is an open source desktop planetarium. It renders the skies in realtime using OpenGL, which means the skies will look exactly like what you see with your eyes, binoculars, or a small telescope. Stellarium is very simple to use, which is one of its biggest advantages: it can easily be used by beginners.
Two Mac OS X binaries of Stellarium are available: if you are running an Intel CPU, and OS X 10.6 or later, use the Intel binary. Otherwise use the Universal Binary (PPC & Intel os 10.5 or greater).
- This is an important bug fix release closing more than 20 bugs in the main application and in the plug-ins. It also brings small GUI usability improvements.
- Mac OS X 10.5 or later
- 3D Card with support for OpenGL
(Via MacUpdate - Mac OS X.)