That's fantastic! I gave F# a look right after MS announced dotnet was being open source and have been excited for it's "arrival" ever since. The pieces seem to be coming together, albeit very slowly..

* "Official" Cross platform support -> dotnet core FTW!

* Cross-IDE intellisense support -> Ionide, Check!

* Dotnet core support -> Check, finally(and make sure to set Ionide to use core)!

* F# to javascript cross compilation project with some traction -> Fable, check(Fable needs serious documentation help though)!

* A great framework competing head on with Phoenix -> Hopefully soon :)

The potential just seems sooo massive. Hopefully it blows up quicker than Haskell ;)