texinfo – Texinfo documentation system

Tex­info is the pre­ferred for­mat for doc­u­men­ta­tion in the GNU project; the for­mat may be used to pro­duce on­line or printed out­put from a sin­gle source.
The Tex­info macros may be used to pro­duce print­able out­put us­ing TeX; other pro­grams in the dis­tri­bu­tion of­fer on­line in­ter­ac­tive use (with hy­per­text link­ages in some cases).
Note that a de­vel­op­ers’ snap­shot of the lat­est re­lease of the Tex­info macros may be found in the Tex­info ‘lat­est’ pack­age.