Autotoolset is both a colection of small tools (scripts, emacs macros, etc.) to simplify project development with autoconf/automake/libtool/texinfo/emacs and a good documentation on how to get started on these tools and the whole GNU software model.
The OO-Browser is an advanced object-oriented class browser with
support for browsing C, C++, Common Lisp and its Object System
(CLOS), Eiffel, Java, Objective-C, Python and Smalltalk. It runs
atop Emacs/XEmacs on Linux, UNIX and Windows.
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SrcComDoc allows documentation written in source comment rows to be extracted, formatted and highlighted according to the chosen documentation format. The basic SrcComDoc syntax is source and documentation language independent.