Suggestions for twoup-gen

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

Package ragged: Generic ragged left and ragged right options
Package cropmark: Crop marks on \shipout
Package tabto-generic: Tab to a measured position in the line
Package cropmark-pu: Cropmark macros for Plain TeX
Package cropmarks-pt: Philip Taylor’s cropmarks macros
Package lua-widow-control: Automatically remove widows and orphans from any document
Package fig2sty: Use fig as layout designer for LaTeX
Package abspos: Absolute placement with coffins
Package acrotex-web: Establish a page layout for an on-screen (PDF) document
Package fullminipage: Minipage spanning a complete page
Package nccparskip: Modify skips between paragraphs
Package pageno: Page number-only page styles
Package wordlike: Simulating word processor layout
Package semioneside: Put only special contents on left-hand pages in two sided layout
Package chet: LaTeX layout inspired by harvmac
Package layaureo: A package to improve the A4 page layout
Package portland: Simple portrait/landscape switching
Package border: Draw a black border around a Plain TeX page
Package cropmrks: Add crop marks to a Plain TeX document
Package firstline: Print the first line of a paragraph in a different font
Package landscape: Set up for typesetting in landscape
Package placeins-plain: Insertions that keep their place
Package pos-at: Position things at absolute positions on the page
Package raggedr: Set an entire document raggedright
Package varindent: Make paragraph indentation match the length of the line above
Package clicks: Slide Deck Animation
Package context-layout: Show ConTeXt layouts
Package emptypage: Make empty pages really empty
Package grid-system: Page organisation, modelled on CSS facilities
Package hardwrap: Hard wrap text to a certain character length
Package hang: Environments for hanging paragraphs and list items