Suggestions for Eoldef

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

Package texapi: Macros to write format-independent packages
Package etoolbox-generic: A loader for etoolbox.sty in non-LaTeX formats
Package default: Provide default parameters for TeX macros
Package visualtoks: Typeset TeXbook-style visualisations of token lists
Package namedef: TeX definitions with named parameters
Package advice: Extend commands and environments
Package yax: Yet Another Key System
Package lparse: Parse macro arguments with Lua using xparse-like specification
Package polexpr: A parser for polynomial expressions
Package chemfig: Draw molecules with easy syntax
Package hitex-def: Support files for HiTeX
Package texdimens: Conversion of TeX dimensions to decimals
Package defstring: Define macros as verbatim macros
Package styledcmd: Handling multiple versions of user-defined macros
Package ccool: A key-value document command parser
Package getoptk: Define macros with sophisticated options
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 mathcommand: \newcommand-like commands for defining math macros
Package etex-pkg: ε-TeX support package
Package etoolbox: ε-TeX tools for LaTeX
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