I googled "apple ii emulator for mac os x" and the results looked promising.
I've experimented this emulator recently, and worked quite good. My settings are (in configuration) Color (tv emulation), audacity temp mail origin 50% scanlines and Use authentic machine speed. Attention for control inputs, since in the Apple II it seems you had to use its numeric keypad to move characters on the screen, and an additional tool like xppader or joy2key are highly recommended in this case.