LaTeX

LaTeX (commonly pronounced LAH-tekh to rhyme with "blecch") is a popular set of add-on macros for the T_EX typesetting system. It has become powerful and popular enough that using TeX directly is now rare.

LaTeX has a peculiar license called LPPL?, not compatible with the GNU General Public License, that requires modified files to carry a modified filename; however, this ensures that files that depend on other files will produce the expected behavior and avoids problems similar to [DLL hell]?.

LyX? is a visual document processor that uses LaTeX for a back-end.

LaTeX's homepage is at http://www.latex-project.org/

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Another topic spelled this way is latex.