lout – An alternative typesetting system
Lout is a long-established typesetting system with many advanced features. Its output is in PostScript, but otherwise TeX users will find many concepts familiar.
GNU General Public License
TeX (or TeX-alike) typesetting engine
Maybe you are interested in the following packages as well.
- lametex: A PostScript translator for a subset of LaTeX
- luatex: The LuaTeX engine
- etex: An extended version of TeX, from the NTS project
- enctex: A TeX extension that translates input on its way into TeX