awesome-fsharp

I'd suggest having a look through https://github.com/fsprojects/awesome-fsharp and look at the high starred items (though some are not strictly F# but just something F# can use) maybe something like suave (backend web framework). The bigger problem I found going down the F# route is F# libraries go dead. For long term projects, far better not to use any thirdpary F# libraries and just use pretty popular third party .net libs from the C# world or the core .net lib. These days I mostly just use C#. The advantages of F# are not that big compared to just writing C# with a similar coding mindset.