Found 2 file extension associations related to Lout and 1 file format developed specifically for use with Lout.
Lout 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.
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 many laser printers and graphic display devices.
If you need more information please contact the developers of Lout (Jeffrey H. Kingston), or check out their product website.