chomsky – Macros to typeset parsing trees
Macros for typesetting parsing trees that (apparently) don't rely on any other packages (the trees are drawn in LaTeX picture mode).
The macros were originally advertised for use with LaTeX 2.09, but will probably work with current LaTeX.
Maybe you are interested in the following packages as well.
- ecltree: Trees using epic and eepic macros
- linguex: Format linguists' examples
- synttree: Typeset syntactic trees
- treetex-ltx209: Draw horizontally- or vertically-oriented trees