| Search Engine | URL | Description |
| Hoogle | https://www.haskell.org/hoogle/ | Hoogle is a Haskell Api Search engine, which allows you to search many standard Haskell libraries by either function name, or by approximate type signature. |
| Hayoo | http://hayoo.fh-wedel.de/ | Search Hackage by function, signature or package. |
Following url categorize the Haskell libraries based on their task.
https://wiki.haskell.org/Applications_and_libraries
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