landscape – Set up for typesetting in landscape
The landscape package is long superseded by the geometry package, which has sophisticated controls on page layout.
Maybe you are interested in the following packages as well.
- lscape: Place selected parts of a document in landscape
- cropmrks: Add crop marks to a Plain TeX document
- placeins-plain: Insertions that keep their place
- espo: Customisation for Esperanto