Suggestions for mathcommand

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

Package forloop: Iteration in LaTeX
Package styledcmd: Handling multiple versions of user-defined macros
Package ccool: A key-value document command parser
Package ltxnew: A simple means of creating commands
Package xoptarg: Expandable macros that take an optional argument
Package xnewcommand: Define \global and \protected commands with \newcommand
Package optparams: Macros with multiple optional parameters
Package cdcmd: Expandable conditional commands for LaTeX
Package lambdax: Use Lambda expression within LaTeX
Package tokmap: Iterate over a token list expandably, without dropping spaces or braced groups
Package xfp: Interface to the LaTeX3 floating point unit
Package xparse: A generic document command parser
Package inlinedef: Inline expansions within definitions
Package cssyntax: Readable, self-documenting command names for LaTeX package authors
Package xtemplate: A high-level interface for declaring document commands
Package letltxmacro: Let assignment for LaTeX macros
Package defstring: Define macros as verbatim macros
Package getoptk: Define macros with sophisticated options
Package tokcycle: Build tools to process tokens from an input stream
Package dvisvgm-def: Colour and Graphics support for dvisvgm
Package dvipdfmx-def: Configuration file for dvipdfmx graphics
Package pdftex-def: Colour and Graphics support for pdfTeX
Package graphics-def: Colour and graphics option files
Package serbian-def-cyr: Serbian cyrillic localization
Package advice: Extend commands and environments
Package default: Provide default parameters for TeX macros
Package eoldef: Define commands which absorb the whole source line as arguments
Package namedef: TeX definitions with named parameters
Package luatex-def: LuaTeX option file for color and graphics
Package xetex-def: Colour and graphics support for XeTeX
Package lparse: Parse macro arguments with Lua using xparse-like specification