Hackage is great and always be the first place to study how function to be defined and used of specific package.
However, frequently, we need refers multi-packages simultaneously, e.g. Control.Monad, Data.List and ... so on, and switches among of them. The easy way to do that is open mulit-tabs in chrome, but as the number of tabs grow, there are many tabs be opened and the name of package on the tab cannot be showed fully.
So, Are there exist some web sites organize Haskell packages documents like javadoc style, we can browse and select packages in right frame and show the content of document in left frame. Furthermore, it is more appreciated if it can save and list frequent use package document in another frame.