Suggestions for WithArrows

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

Package chemfig: Draw molecules with easy syntax
Package systeme: Format systems of equations
Package polexpr: A parser for polynomial expressions
Package eqnarray: More generalised equation arrays with numbering
Package youngtab: Typeset Young-Tableaux
Package tuple: Expandable operations for tuples of numbers
Package cases: Numbered cases environment
Package subeqnarray: Equation array with sub numbering
Package ltxcmds: Some LaTeX kernel commands for general use
Package namedef: TeX definitions with named parameters
Package pdftexcmds: LuaTeX support for pdfTeX utility functions
Package hologo: A collection of logos with bookmark support
Package iftex: Am I running under pdfTeX, XeTeX or LuaTeX?
Package luakeys: A Lua module for parsing key-value options
Package calcfrac: Calculates the value of an expression containing fractions
Package luamesh: Computes and draws 2D Delaunay triangulation
Package nicematrix: Improve the typesetting of matrices and tabulars with PGF
Package lparse: Parse macro arguments with Lua using xparse-like specification
Package expkv-bundle: An expandable key=val implementation and friends
Package stretchy: Macros for creating stretchy TeX symbols
Package pdfmsym: PDF Math Symbols – various drawn mathematical symbols
Package bchart: Draw simple bar charts in LaTeX
Package spalign: Typeset matrices and arrays with spaces and semicolons as delimiters
Package luatexja: Typeset Japanese with Lua(La)TeX
Package schemata: Print topical diagrams
Package autoaligne: Align terms and members in math expressions
Package xlop: Calculates and displays arithmetic operations
Package letterswitharrows: Draw arrows over math letters
Package collargs: Collect arguments of any command
Package localloc: Macros for localizing TeX register allocations
Package tokmap: Iterate over a token list expandably, without dropping spaces or braced groups