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.
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support for linguistics
mechanisms for drawing trees
Maybe you are interested in the following packages as well.
- qtree: Draw tree structures
- synttree: Typeset syntactic trees
- xyling: Draw syntactic trees, etc., for linguistics literature, using xy-pic
- tree-dvips: Trees and other linguists' macros