To get Graphical Info reader in El Capitan?
The obvious one is emacs itself as info is its documentation format

The Apple supplied emacs does do this in the terminal as do more up to date ones

There are graphical versions Emacs.app for pure emacs and Aquamacs trying to be more like a standard OSX app. 

If you need this from the command line other make .info files opened by the emacs app and use the command open or use emacsclient