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
- declare: Declare register names locally
- unouter: Suppress \outer flags in Plain TeX
- getoptk: Define macros with sophisticated options