Resources, consulting services, downloads, freeware for Windows 95/98/Me-NT/2000/XP; learn about the CWEB programming system; articles, books, CD, tools, news, links.
A WEB system of structured documentation for multiple languages, originally the F was for FORTRAN, but now handles C, C++, Fortran (F77, F90), RATFOR, TeX (somewhat), tries to implement WYSIWYG language-independent mode. Open source, GPL.
Portable, production quality LP macro preprocessor, allows interweaving code and documentation for any programming language; emits HTML and TeX; runs on most platforms; Open source.