Good animation program for Mac

I’m looking for a good animation program for Mac, can anyone help me? I’d like it to be free.

Well this program isnt free (its quite expensive actually) but there is a free 30 day trial go to macromedia.com and look for a program called Macromedia Flash MX its a pretty big file and takes a wile to load if your computer is older then i dont recomend this program. I use windows but the program is made for mac/windows.

Edit:If you have any Questions PM me

no sorry i use windows 8)