Cloogle is the unofficial Clean language search engine.
The following search strings are recognised:
|hd||Functions with a name like
|:: a [a] -> a||Functions with a type unifiable with
|hd :: [a] -> a||A combination of the above|
|:: A.a: [a] -> a||Type search, where
|type Maybe||The type definition of
|class Text||The class definition of
Besides this web app, there are other frontends available:
!clooglebang on DuckDuckGo
:Clooglecommand in Vim, if you use vim-clean
You can also browse the standard libraries.