The OmniSharp work is mostly focused on C#, but if you are interested in F#, you should check out Ionide (http://ionide.io). It provides similar experience to OmniSharp, but has support for some other great tools used by the F# community (FAKE build tool, Paket package manager, etc.) There is also new upcoming F# Interactive integration that lets you embed graphics, charts and whatnot in the REPL.