Microsoft's development environment is going cross-platform.
Visual Studio, Microsoft's integrated development environment (IDE), will soon be available for the Mac. The company will roll out a preview version of Visual Studio for Mac at its Connect(); conference later this week. This version of the IDE focuses on developing Mac, iOS, and Android apps using the C# language, and puts an emphasis on building for multiple platforms.
From Microsoft's (now-cached) blog post:
The primary workloads supported by Visual Studio for Mac are native iOS, Android and Mac development via Xamarin, and server development via .NET Core with Azure integration. It gives you all the tools you need to develop the rich, native mobile app experiences that users expect today, and the cloud-based server back ends to power them.
The preview release of Visual Studio for Mac is just Microsoft's latest cross-platform move for developers. The company released Visual Studio Code, a cross-platform source code editor, for macOS (then OS X) and other platforms in 2015.