Lout is a document formatting system designed and implemented by Jeffrey Kingston at the Basser Department of Computer Science, University of Sydney, Australia.

The system reads a high-level description of a document similar in style to LaTeX and produces a PostScript file which can be printed on most laser printers and graphic display devices.

Plain text output is also available, PDF output is limited but working (e.g. no graphics).

Lout is inherently multilingual. Adding new languages is easy.