Suggestions for outerhbox

The following packages have something in common with the package outerhbox. The packages are ordered in decreasing similarity.

Package shadebox: Shade boxes using PostScript specials
Package frame: Framed boxes for Plain TeX
Package boxit-ltx: An environment for boxing things
Package boxit: Draw a box around a text
Package ovalfbox: Boxes with frames whose corners are rounded
Package split: Box two chunks of text side-by side
Package tabbingbox: Save a tabbing environment in a box
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 hep-gen: Generic macros for quantum physics
Package longdiv: Long division arithmetic problems
Package letterspacing: Letter spacing
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