MetaTrader 4 for Mac!
Good news and bad news.
Bad news: Unfortunately, we cannot install MT4 directly into a Mac OS.
Good news: We can use certain software to allow us to install MT4 on Mac.
Method 1 (Preferred Method):
Install Windows using Boot Camp (Preferred), Parallel or VMware. Then install MT4 on the Windows OS.
Use software like PlayOnMac and WineBottler to create a layer in your MAC OS that allows you to use Windows software.