texinfo

Texinfo is a documentation system that uses a single source file to
produce both online information and printed output.  Using Texinfo, you
can create a printed document with the normal features of a book,
including chapters, sections, cross-references, and indices.  From the
same Texinfo source file, you can create a menu-driven, online info
file with nodes, menus, cross-references, and indices using the included
makeinfo tool.

          

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License: GPL-3.0-or-later
URL: https://www.gnu.org/software/texinfo/