plainpkg.

The package provides a minimal method for making generic (i.e., TeX-format-independent) packaged, combining maybeload functionality, fallback definitions for LaTeX \ProvidesPackage and \RequirePackage functionality, and handling of arbitrary (multiple) “private letters” (analagous LaTeX packages’ use of “@”) in nested package files. The documentation contains a central reference for making and using generic packages based on the package.