As part of a continuing quest for knowledge, I'm spending some time this week learning the basics of F# as an introduction to functional programming. I think I am understanding the construction of software under this model and some of the proposed benefits, but am still a little fuzzy on the real-world use cases.
I was hoping that a F# success stories, or at least a few applications that I'd be familiar with might make it a little clearer about when F# (or any functional programming language) would be appropriate for a project.
So back to the question, what are some well known applications that use F# or a similar functional programming language?
BTW: I am also open to hearing about some lesser-known apps, but if you mention one, please give the basics of what the app is about and why the language used was the appropriate choice.