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.
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support for development of (La)TeX macros
Maybe you are interested in the following packages as well.
- firstline: Print the first line of a paragraph in a different font
- unouter: Suppress \outer flags in Plain TeX
- miniltx: An abstract of LaTeX facilities for use with Plain TeX
- bibplain: Simple macros for using BibTeX with Plain TeX