Suggestions for marginalia

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

Package marginnote: Notes in the margin, even where \marginpar fails
Package zebra: Writing revision toolkits
Package marginfix: Patch \marginpar to avoid overfull margins
Package luatodonotes: Add editing annotations in a LuaLaTeX document
Package smartnotes: Visually anchored margin notes with connector lines and dynamic placement
Package mparhack: Work around a LaTeX bug in marginpars
Package marginfit: Improved margin notes
Package sidenotes: Typeset notes containing rich content, in the margin
Package snotez: Typeset notes, in the margin
Package marginote: Make numbered notes in the margin
Package luatextra: Additional macros for Plain TeX and LaTeX in LuaTeX
Package showkerning: Showing kerns in a document
Package notes2bib: Integrating notes into the bibliography
Package pagenote: Notes at end of document
Package parnotes: Notes after every paragraph (or elsewhere)
Package threeparttable: Tables with captions and notes all the same width
Package threeparttablex: Notes in longtables
Package fixme: Collaborative annotation tool for LaTeX
Package versonotes: Display brief notes on verso pages
Package marginal: Extensions to \marginpar handling
Package combofont: Add NFSS-declarations of combo fonts to LuaLaTeX documents
Package luainputenc: Replacing inputenc for use in LuaTeX
Package luahyphenrules: Loading patterns in LuaLaTeX with language.dat
Package lua-check-hyphen: Mark hyphenations in a document, for checking
Package luarandom: Create lists of random numbers
Package lualatex-truncate: A wrapper for using the truncate package with LuaLaTeX
Package lua-typo: Highlighting typographical flaws with LuaLaTeX
Package lualatex-math: Fixes for mathematics-related LuaLaTeX issues
Package luaoptions: Option handling for LuaLaTeX packages
Package luacode: Helper for executing Lua code from within TeX
Package linebreaker: Prevent overflow boxes with LuaLaTeX