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Visual Studio isn't free in that regard either. What exactly are you comparing this release to?

http://fsharp.org/use/linux/ feel free to give F# a try. Apple hardware ( or MSFT tax) not required.

VS has non-paid versions. And C# and F# compilers are open source.

Yes, but you need Windows and a Windows PC to run them. I guess you could get Linux for C# and F# but you still need to buy a PC.

How are you doing development without a non-mobile OS? But I imagine http://www.tryfsharp.org/ works even for mobile.

No, F# runs everywhere C# does - you don't need a PC.