texinfo - software documentation system
Texinfo is a documentation system that uses a single source file to produce both online information and printed output. It is primarily designed for writing software manuals. For a full description of the Texinfo language and associated tools, please see the Texinfo manual (written in Texinfo itself). Most likely, running this command from your shell: info texinfo or this key sequence from inside Emacs: M-x info RET m texinfo RET will get you there.
ftp://ftp.gnu.org/gnu/texinfo/ or any GNU mirror site.
Please send bug reports to firstname.lastname@example.org, general questions and discussion to email@example.com.
info(1), install-info(1), makeinfo(1), texi2dvi(1), texindex(1). emacs(1), tex(1). info(5). FSF GNU Texinfo TEXINFO(5)
You can also request any man page by name and (optionally) by section: