Doxygen
Doxygen is the de facto standard tool for generating documentation from annotated C++ sources, but it also supports other popular programming languages such as C, Objective-C, C#, PHP, Java, Python, IDL (Corba, Microsoft, and UNO/OpenOffice flavors), Fortran, VHDL, Tcl, and to some extent D.
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Alternatives to Doxygen
Apiary
Paid
Apiary provides the leading API-First platform designed specifically to help companies accelerate and control the design, development, and documentation of APIs.
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