Suggestions for xkeymask

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

Package clefval: Key/value support with a hash
Package keyval2e: A lightweight and robust key-value parser
Package keyreader: A robust interface to xkeyval
Package options: Provides convenient key-value options for LaTeX package writers
Package pgfkeyx: Extended and more robust version of pgfkeys
Package skeyval: Key-value parsing combining features of xkeyval and pgfkeys
Package ltxkeys: A robust key parser for LaTeX
Package pst-xkey: Key-value syntax for PSTricks packages
Package pgfkeysearch: Find keys in a given path recursively
Package catoptions: Preserving and recalling standard catcodes
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 skeycommand: Create commands using parameters and keyval in parallel
Package xkeyval: Extension of the keyval package
Package keycommand: Simple creation of commands with key-value arguments
Package affilauthor: Tag author and affiliation information in a key-value style
Package l3keys2e: LaTeX2ε option processing using LaTeX3 keys
Package pgfopts: LaTeX package options with pgfkeys
Package tikzquests: A parametric questions’ repositories framework
Package scrbase: Provide basic features for KOMA-Script
Package keyval: Process key=value schemes
Package keytheorems: An l3keys interface to amsthm
Package expkv-def: A key-defining frontend for expkv
Package expkv-opt: Parse class and package options with expkv
Package expkv: An expandable key=val implementation
Package yax: Yet Another Key System
Package koma-script: A bundle of versatile classes and packages
Package simplekv: A simple key/value system for TeX and LaTeX
Package expkv-cs: Define expandable key=val macros using expkv
Package luakeyval: A minimal key/value system for LuaTeX based on token.scan_key_cs