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ROBODoc - Supports C, C++, Fortran, Perl, shell scripts, Assembler, DCL, DB/C, Tcl/Tk, Forth, Lisp, COBOL, Occam, Basic, HTML, Clarion, and any other language that supports remarks.
Doxygen - Generate documentation from source code
DocFX - A documentation generation tool for API reference and Markdown files!
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
NDoc - NDoc generates class library documentation from .
MadCap Flare - Documentation for Any Audience, Language or Format