Suggestions for todonotes

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

Package fixme: Collaborative annotation tool for LaTeX
Package luatodonotes: Add editing annotations in a LuaLaTeX document
Package bchart: Draw simple bar charts in LaTeX
Package threeparttable: Tables with captions and notes all the same width
Package threeparttablex: Notes in longtables
Package versonotes: Display brief notes on verso pages
Package vertbars: Mark vertical rules in margin of text
Package changes: Manual change markup
Package ezedits: Commands for tracking document changes and notes
Package easy-todo: To-do notes in a document
Package fixmetodonotes: Add notes on document development
Package snaptodo: A todo that snaps to the closer side
Package todo: Make a to-do list for a document
Package zebra: Writing revision toolkits
Package easyreview: Package to provide a way to review (or perform editorial process) in LaTeX
Package smartnotes: Visually anchored margin notes with connector lines and dynamic placement
Package notebeamer: A template for printing presentations on notepaper
Package chronology: Provides a horizontal timeline
Package nicematrix: Improve the typesetting of matrices and tabulars with PGF
Package prelim2e: Allows the marking of preliminary versions of a document
Package skeldoc: Placeholders for unfinished documents
Package tikz-cd: Create commutative diagrams with TikZ
Package luamesh: Computes and draws 2D Delaunay triangulation
Package letterswitharrows: Draw arrows over math letters
Package rpgicons: Icons for tabletop role-playing games
Package quiver: Draw commutative diagrams exported from https://q.uiver.app
Package pgfplots: Create normal/logarithmic plots in two and three dimensions
Package quantikz: Draw quantum circuit diagrams
Package marginnote: Notes in the margin, even where \marginpar fails
Package notes2bib: Integrating notes into the bibliography
Package pagenote: Notes at end of document