backgrnd – Mark text with grey background or change bar
Marks text, using TeX's resources only (without resorting to \special commands). Grey background uses a shade font provided as METAFONT source. Works under plain TeX and in simple LaTeX 2.09 documents, but probably not in LaTeX 2e.
Maybe you are interested in the following packages as well.
- annotation-pkg: Suppress or permit annotations to a document
- marnote: Place text in the margin of a document
- comment-pln: Comment macros for use in Plain TeX
- kbordermatrix: LaTeX version of \bordermatrix