extradefs – A miscellany of support macros
The macros work equally in LaTeX and Plain TeX; no documentation is available, even as comments in the file.
Maybe you are interested in the following packages as well.
- firstline: Print the first line of a paragraph in a different font
- toc: Table of contents macros for Plain TeX
- miniltx: An abstract of LaTeX facilities for use with Plain TeX
- font-change: Macros to change text and mathematics fonts in plain TeX