JetBrains Rider 2017.3 MacOSX | 376 MB
JetBrains Rider is a new cross-platform .NET IDE based on the IntelliJ platform and ReSharper.

Supports most .NET project types
Rider supports .NET Framework, the new cross-platform .NET Core, and Mono based projects. This lets you develop a wide array of applications including .NET desktop applications, services and libraries, Unity games, Xamarin apps, ASP.NET and ASP.NET Core web applications.

Feature-rich and fast
Rider provides 2500+ live code inspections, hundreds of context actions and refactorings brought by ReSharper, and combines them with the IntelliJ platform's solid IDE features. Despite a heavy feature set, Rider is designed to be fast and responsive.

System requirements

macOS 10.8 or higher
1 GB RAM minimum, 2 GB RAM recommended
300 MB hard disk space + at least 1 GB for caches
1024x768 minimum screen resolution

Home Page -

https://www.jetbrains.com