Suggestions for L3keys2e

The following packages have something in common with the package L3keys2e. The packages are ordered in decreasing similarity.

Package l3packages: High-level LaTeX3 concepts
Package xfp: Interface to the LaTeX3 floating point unit
Package xparse: A generic document command parser
Package xtemplate: A high-level interface for declaring document commands
Package xargs: Define commands with many optional arguments
Package etl: Expandable token list operations
Package l3experimental: Experimental LaTeX3 concepts
Package expl3: Wrapper package for experimental LaTeX3
Package zhlipsum: Chinese dummy text
Package functional: An intuitive functional programming interface for LaTeX2
Package catoptions: Preserving and recalling standard catcodes
Package skeycommand: Create commands using parameters and keyval in parallel
Package pgfopts: LaTeX package options with pgfkeys
Package kvdefinekeys: Define keys for use in the kvsetkeys package
Package kvoptions: Key value format for package options
Package kvsetkeys: Key value parser with default handler support
Package xkeyval: Extension of the keyval package
Package keycommand: Simple creation of commands with key-value arguments
Package expkv-bundle: An expandable key=val implementation and friends
Package xcoffins: Rich boxed material for LaTeX 3
Package xfrac: Split-level fractions
Package hawkdraw: Draw vector graphics using l3draw with a simple syntax
Package forloop: Iteration in LaTeX
Package l3regex: Regular expression facilities for LaTeX
Package luakeys: A Lua module for parsing key-value options
Package scrbase: Provide basic features for KOMA-Script
Package unravel: Watching TeX digest tokens
Package keyval: Process key=value schemes
Package eolgrab: Catch arguments delimited by end of line
Package savesym: Redefine symbols where names conflict
Package flags: Setting and clearing of flags in bit fields