C# MAC

http://www.monodevelop.com/download/

To compile and run C# programs you'll need an IDE, MonoDevelop is the one to get. Download a copy of XamarinStudio (MonoDevelop coupled with Xamarin iOS/Android plugins) from the MonoDevelop website:

    Go to MonoDevelop and click Download Xamarin Studio under OS X.
    Double-click "XamarinStudio-5.10.1.6-0" (or later) in the Downloads folder.
    Drag Xamarin to the Applications folder.
    Double-click Xamarin in the Applications folder.
    Click Download Mono Framework. It will open the Mono Project.
    Click Download Mono Universal Installer.
    Double-click "MonoFramework-MDK-4.4.0.142.macos10.xamarin.universal" file to open it.
    Click Continue and follow the Mono Framework installer instructions.

When the installation has finished, return to the Applications folder and open the Xamarin Studio library again.


http://www.macworld.co.uk/how-to/mac/how-learn-c-sharp-in-os-x-3640347/