Suggestions for emtrees
The following packages have something in common with the package emtrees. The packages are ordered in decreasing similarity.
- dirtree: Display trees in the style of windows explorer
 - proofs: Macros for building proof trees
 - chomsky: Macros to typeset parsing trees
 - plainmisc: Miscellaneous contributed macros for plain TeX
 - ruler: A typographic ruler for TeX
 - olsak-misc: Collection of plain TeX macros written by Petr Olšák
 - calendarweek: Calculate the week number of a date
 - epigram: Display short quotations
 - kbordermatrix: LaTeX version of \bordermatrix
 - quotation: Typeset an attributed quotation
 - arabic: Read a lower-case roman number
 - backgrnd: Mark text with grey background or change bar
 - chessmin: Minimal chess diagrams
 - dow: Calculate day of week from a numeric date
 - fakebold: A simple macro for faking bold fonts
 - hep-gen: Generic macros for quantum physics
 - inscrutable: A response to Perl hackers' silliness
 - longdiv: Long division arithmetic problems
 - letterspacing: Letter spacing
 - nth: Generate English ordinal numbers
 - outerhbox: Collect horizontal material for contributing to a paragraph
 - ragged: Generic ragged left and ragged right options
 - swrule: Lines thicker in the middle than at the ends
 - underlin-gen: Multi-word underlining
 - undertilde-gen: A simple macro for placing a tilde under a character
 - verbatim-gen: Generic macros for setting text verbatim
 - wiggly: Draw wiggly lines under text
 - zip: Barcodes for USA ZIP code
 - endnote: Generic “endnotes” code
 - mathlig: Define maths “ligatures”
 - tabto-generic: “Tab” to a measured position in the line