plain-ltx – Make plain TeX files LaTeXable

The package plain.sty defines a LaTeX environment which can process a document written to use Knuth's basic Plain TeX macros.

Inside the environment, not everything is as Knuth intended (some Plain commands are suppressed, some are faked, and some basic mechanisms – such as font selection and the output routine – remain as in LaTeX). Thus simple documents will run, but elaborate macros defined in the document have a chance of failing.

The package is distributed as part of the carlisle bundle.