As announced at the Microsoft Build conference, Visual Studio for Mac is now generally available. It is the recommended environment for Xamarin developers on Mac moving forward. Visual Studio for Mac has all the features of Xamarin Studio, adds cloud and web development, and contains improvements for cross-platform mobile development.
To get started with Visual Studio on Mac, download and run the Visual Studio for Mac installer. It will leave Xamarin Studio unchanged, update the other Xamarin packages to the current versions, and install the Visual Studio for Mac app. Xamarin Studio can continue to be used alongside Visual Studio for Mac if desired, but please note that Xamarin Studio 6.3 is not fully forwards-compatible with the new portable .pdb debug symbols format generated by default in the new Xamarin 15.2 release with Mono 5.0, so you will need to use Visual Studio for Mac to hit breakpoints and break where expected on unhandled exceptions.