Without a shadow of a doubt, cgminer and bfgminer are the foremost coin mining applications available today, but the process of installation on Mac OS is lengthy for those without the requirements already installed.
MacMiner uses both as well as a range of CPU Miners as backends to it's GUI and can be used as a whole packaged download for cgminer, bfgminer and minerd (cpuminer) - Instructions can be found here. As the backend miners are compiled regularly for it, they are also provided seperately here for download without the app. With these downloads you can run cgminer and bfgminer without having to do any install other than downloading and decompressing the .zip file. MacMiner is recommended over these separate packes as it is more thoroughly tested - but it does waste about 90Mb of space if you don't want the friendly user interface and are sure you'll only be operating on the command line in the Mac OS X Terminal.
Each are maintained on a page of their own:
(recommended for users of 10.9 Mavericks, 10.10 Yosemite and GPU miners of all OS versions)
(recommended for users of Mac OS 10.6, 10.7 and 10.8 using FPGA/ASIC devices)