{setspace} is a package providing support for setting the spacing between lines in a document, e.g. allowing double-spacing.
Provides support for setting the spacing between lines in a document. Package options include singlespacing, onehalfspacing, and doublespacing. Alternatively, the spacing can be changed as required with the \singlespacing, \onehalfspacing, and \doublespacing commands. Other size spacings also available.
As of 2012-4-5 the package is maintained by Robin Fairbairns. In past Geoffrey Tobin and Erica Harris have both worked on the package, though neither is currently active.