• tikz-qtree
  The LaTeX package provides a macro for drawing trees with TikZ using the easy syntax of Alexis Dimitriadis' Qtree. It improves on TikZ's standard tree-drawing facility by laying out tree nodes without collisions; it improves on Qtree (qtree) by adding lots of features from TikZ (for example, edge labels, arrows between nodes); and it improves on pst-qtree in being usable with pdfTeX and XeTeX.
  in Software > Text > TeX and LaTeX with latex tree tree-drawing xetex
• Tree of Life
  in Science with science tree by 8 users
• XTAG (TAG)
  XTAG is an on-going project to develop a wide-coverage grammar for English using a lexicalized Tree Adjoining Grammar (TAG) formalism. XTAG also serves as an system for the development of TAGs and consists of a parser, an X-windows grammar development interface and a morphological analyzer.
  code source
  in Linguistics > Syntax with adjoining grammar lexicalized linguistics syntax tree

tree from all users