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The standard 'man' documentation suite.
'man' is the man pager.
'man2html' is an utility that converts man pages to html
'hman' is a man browser that uses your favorite browser. For use with lynx, no http daemon is required.
'whatis', 'makewhatis', 'apropos', 'man2dvi' are of course also part of the suite.
Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors) and to some extent PHP, C#, and D.
Doxygen is developed under Linux and Mac OS X, but is set-up to be highly portable. As a result, it runs on most other Unix flavors as well. Furthermore, executables for Windows are available.
a tool for automatically generating documentation from annotated Haskell source code. It is primarily intended for documenting libraries, but it should be useful for any kind of Haskell code.
Pinfo is a hypertext info file viewer with a user interface similar to lynx. It is based on curses/ncurses, and can handle info pages as well as man pages. It also features regexp searching and user-defined colors/keys.