http://www.pure-mac.com/astronomy.html
A link with a collection of astronomy software for those who are running Mac.
Some software might be old so just google for the later verison
I am currently running Stellarium, SkySafari and AstroPlanner on my Mac.
Excellent programs. I still need to suss out AstroPlanner more as it is a very powerful and complex package. I just installed DSLR Shutter and will have a play around with it.
If you are running Mac what software do you run for your astronomy needs?