comment-pln – Comment macros for use in Plain TeX
Defines macros \comment and \endcomment such that everything between the two is ignored.
Maybe you are interested in the following packages as well.
- comment: Selectively include/exclude portions of text
- optional: Facilitate optional printing of parts of a document
- xcomment: Allows selected environments to be included/excluded
- ifthenx: Extra tests for \ifthenelse