Suggestions for centeredline

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

Package arydshln: Draw dash-lines in array/tabular
Package tabbing: Extended tabbing environment with accented-letter support
Package autoaligne: Align terms and members in math expressions
Package cuted: Mixing onecolumn and twocolumn modes
Package leaflet: Create small handouts (flyers)
Package magaz: Magazine layout
Package needspace: Insert pagebreak if not enough space
Package savetrees: Optimise the use of each page of a LaTeX document
Package wallpaper: Easy addition of wallpapers (background images) to LaTeX documents, including tiling
Package crop: Support for cropmarks
Package layouts: Display various elements of a document’s layout
Package tabto-ltx: Tab to a measured position in the line
Package booklet: Aids for printing simple booklets
Package textpos: Place boxes at arbitrary positions on the LaTeX page
Package truncate: Limit output text to a specified width
Package layout: View the layout of a document
Package shapepar: A macro to typeset paragraphs in specific shapes
Package array: Extending the array and tabular environments
Package emptypage: Make empty pages really empty
Package hardwrap: Hard wrap text to a certain character length
Package nowidow: Avoid widows
Package vruler: Numbering text
Package midpage: Environment for vertical centring
Package rotpages: Typeset sets of pages upside-down and backwards
Package linegoal: A dimen that returns the space left on the line
Package hanging: Paragraphs with a hanging indent
Package monofill: Alignment of plain text
Package arraycols: New column types for array and tabular environments
Package showframe: Draw a page-layout diagram
Package lscapeenhanced: An enhancement to the lscape and pdflscape packages
Package adjmulticol: Adjusting margins for multicolumn and single column output