Suggestions for Zebra

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

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 easyreview: Package to provide a way to review (or perform editorial process) in LaTeX
Package marginnote: Notes in the margin, even where \marginpar fails
Package smartnotes: Visually anchored margin notes with connector lines and dynamic placement
Package pdfreview: Annotate PDF files with margin notes
Package marginote: Make numbered notes in the margin
Package skeldoc: Placeholders for unfinished documents
Package fixme: Collaborative annotation tool for LaTeX
Package marginal: Extensions to \marginpar handling
Package marginalia: Marginal content anywhere with automatic adjustment for LuaLaTeX
Package flexipage: Flexible page geometry with marginalia
Package mnotes: Margin annotation for collaborative writing
Package sidenotesplus: Place referenced notes, alerts, figures and tables into the document margin
Package todonotes: Marking things to do in a LaTeX document
Package marginfix: Patch \marginpar to avoid overfull margins
Package margbib: Display bibitem tags in the margins
Package nameauth: Name authority mechanism for consistency in body text and index
Package debate: Debates between reviewers
Package mindflow: Write your ideas in a clear way
Package notes: Mark sections of a document
Package zennote: Streamline your note-taking process!
Package luatodonotes: Add editing annotations in a LuaLaTeX document
Package ed: Editorial Notes for LaTeX documents
Package draftmark: Put draft marks on selected pages
Package errata: Error markup for LaTeX documents
Package minorrevision: Quote and refer to a manuscript for minor revisions
Package vrsion: Add version number to a DVI file