There is Hadoop, Microsoft have been pursuing it aggressively recently.
SciPy type stuff is best handled using F#, which also works on Mono, and has some features that I haven't seen in any other languages (e.g. Type Providers).
There are multiple .NET web frameworks, including Microsoft's own ASP.NET MVC and Web API, but also OSS efforts like FubuMVC, Nancy, ServiceStack, Simple.Web and more, most of which work as well on Mono as on MS .NET.
As you say, the Node story on Windows has improved lately, and most current languages work as well on Windows as on any other platform.
C# itself is probably second only to JavaScript in terms of cross-platform development: Xamarin for Mac and mobile; Mono for Linux (yes, it's incomplete, but Linux people should be used to that); Unity for game development across consoles, mobile devices, web and traditional PCs. By "cross-platform" I don't necessarily mean write-once-run-everywhere, which results in lowest common denominator dreck anyway, but the ability to reuse your skills and some code in many different environments and domains.
SciPy type stuff is best handled using F#, which also works on Mono, and has some features that I haven't seen in any other languages (e.g. Type Providers).
There are multiple .NET web frameworks, including Microsoft's own ASP.NET MVC and Web API, but also OSS efforts like FubuMVC, Nancy, ServiceStack, Simple.Web and more, most of which work as well on Mono as on MS .NET.
As you say, the Node story on Windows has improved lately, and most current languages work as well on Windows as on any other platform.
C# itself is probably second only to JavaScript in terms of cross-platform development: Xamarin for Mac and mobile; Mono for Linux (yes, it's incomplete, but Linux people should be used to that); Unity for game development across consoles, mobile devices, web and traditional PCs. By "cross-platform" I don't necessarily mean write-once-run-everywhere, which results in lowest common denominator dreck anyway, but the ability to reuse your skills and some code in many different environments and domains.