Suggestions for chemarrow

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

Package chemarr: Arrows for chemists
Package ghsystem: Globally harmonised system of chemical (etc) naming
Package achemso: Support for American Chemical Society journal submissions
Package chemsym: Macros for typing chemical symbols
Package xymtex: Typesetting chemical structures
Package carbohydrates: Carbohydrate molecules with chemfig
Package modiagram: Drawing molecular orbital diagrams
Package chemnum: A method for numbering chemical compounds
Package chemgreek: Upright Greek letters in chemistry
Package pb-diagram: A commutative diagram package using LAMS-TeX or Xy-pic fonts
Package chemformula: Command for typesetting chemical formulas and reactions
Package transition-metals: Hybridization diagrams for transition metal complexes
Package chemtex: Structural chemistry
Package chemfig: Draw molecules with easy syntax
Package upgreek: Upright Greek letters
Package syntax-mdw: Typeset syntax descriptions
Package babel-esperanto: Babel support for Esperanto
Package schemata: Print topical diagrams
Package slashed: Put a slash through characters
Package dotlessj: Generates a dot-less j
Package siunitx: A comprehensive (SI) units package
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 algorithmicx: The algorithmic style you always wanted
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 changepage: Margin adjustment and detection of odd/even pages