Suggestions for Hep-gen

The following packages have something in common with the package Hep-gen. The packages are ordered in decreasing similarity.

Package anti: Typeset an anti-particle in maths mode
Package qm: Commands for bras and kets and the like
Package ruler: A typographic ruler for TeX
Package olsak-misc: Collection of plain TeX macros written by Petr Olšák
Package arabic: Read a lower-case roman number
Package backgrnd: Mark text with grey background or change bar
Package dow: Calculate day of week from a numeric date
Package emtrees: Draw labelled trees, using emTeX \specials
Package fakebold: A simple macro for faking bold fonts
Package longdiv: Long division arithmetic problems
Package letterspacing: Letter spacing
Package outerhbox: Collect horizontal material for contributing to a paragraph
Package ragged: Generic ragged left and ragged right options
Package swrule: Lines thicker in the middle than at the ends
Package undertilde-gen: A simple macro for placing a tilde under a character
Package verbatim-gen: Generic macros for setting text verbatim
Package wiggly: Draw wiggly lines under text
Package calendarweek: Calculate the week number of a date
Package epigram: Display short quotations
Package quotation: Typeset an attributed quotation
Package underlin-generic: Multi-word underlining
Package inscrutable: A response to Perl hackers’ silliness
Package endnote: Generic endnotes code
Package mathlig: Define maths ligatures
Package tabto-generic: Tab to a measured position in the line
Package zip: Barcodes for USA ZIP code
Package balancedquotes: Code balanced quotes according to document language
Package daytime: Print time of day
Package default: Provide default parameters for TeX macros
Package mandel: Compute the Mandelbrot set
Package pagereference: Labels and references in Plain TeX