Mac users interested in Xamarin for osx 10.5.8 generally download:
Xamarin Studio allows you to build apps for iOS, Android and Mac.
Main features:
- View controllers and controls are a pixel-perfect representation of screens as they will appear when running on iOS devices.
- Live-rendered custom controls.
- Quickly configure the appearance, layout, field names, and event handlers for controls and views using a sleek properties pad.
