Suggestions for Longtwocolumn

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

Package flushend: Balancing columns at last page
Package balance: Balanced two-column mode
Package pbalance: Balance last page in two-column mode
Package cuted: Mixing onecolumn and twocolumn modes
Package adjmulticol: Adjusting margins for multicolumn and single column output
Package vwcol: Variable-width multiple text columns
Package multicol: Intermix single and multiple columns
Package ltxgrid: Control of the page grid
Package upgreek: Upright Greek letters
Package babel-esperanto: Babel support for Esperanto
Package leporello: A simple LaTeX document class to create folded leaflets using columns and boxes
Package slashed: Put a slash through characters
Package dotlessj: Generates a dot-less j
Package chemarr: Arrows for chemists
Package centernot: Centred \not command
Package amsrefs: A LaTeX-based replacement for BibTeX
Package eqnlines: Single- and multiline equations
Package acronym: Expand acronyms at least once
Package appendix: Extra control of appendices
Package algorithms: A suite of tools for typesetting algorithms in pseudo-code
Package bxcoloremoji: Use color emojis more conveniently
Package boxedminipage: Framed minipages of a specified total width (text and frame combined)
Package chemarrow: Arrows for use in chemistry
Package changepage: Margin adjustment and detection of odd/even pages
Package chngpage: Change the page layout in the middle of a document
Package circledtext: Create circled text
Package cite: Improved citation handling in LaTeX
Package crossreftools: Expandable extraction of cleveref data
Package colophon: Provides commands for producing a colophon
Package calrsfs: Copperplate calligraphic letters in LaTeX
Package doclicense: Support for putting documents under a license