Does F# have pursuit or hoogle?

Question

I saw recently that some code (Fake, specifically) uses a function @@ without defining it, presumeably it exists as part of the F# standard library, or somewhere else in .NET.

How do I search online for this type? Is there a pursuit-like or hoogle-like database I can use?

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This question focuses more on how to find a particular function, and incidentally, hoogle alternatives. There are two very good answers, and the nature of the answers and comments are quite different.

Answer 1

There is FSDN that allows hoogle-like searching in mscorlib, some System.* dlls and a few libraries (including FAKE).

Update 2022-06-11: FSDN seems to be offline. I don’t know an alternative.