Wikipedia
Noweb
noweb is a literate programming tool, created in 1989–1999 by Norman Ramsey, and designed to be simple, easily extensible and language independent.
As in WEB and CWEB, the main components of noweb are two programs: "notangle", which extracts 'machine' source code from the source texts, and "noweave", which produces nicely-formatted printable documentation.
noweb supports TeX, LaTeX, HTML, and troff back ends and works with any programming language. Besides simplicity this is the main advantage over WEB, which needs different versions to support programming languages other than Pascal. (Thus the necessity of CWEB, which supports C and similar languages.)