Suggestions for pgfopts

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

Package translator: Easy translation of strings in LaTeX
Package translations: Internationalisation of LaTeX2ε packages
Package l3keys2e: LaTeX2ε option processing using LaTeX3 keys
Package luaoptions: Option handling for LuaLaTeX packages
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 aebslicing: An image slicer
Package scrlfile: Installation control for KOMA-Script packages
Package verifycommand: Verifies definitions are unchanged, such as before patching
Package interfaces: Set parameters for other packages, conveniently
Package scrbase: Provide basic features for KOMA-Script
Package tracklang: Language and dialect tracker
Package keyval: Process key=value schemes
Package catoptions: Preserving and recalling standard catcodes
Package skeycommand: Create commands using parameters and keyval in parallel
Package sdaps: LaTeX support files for SDAPS
Package l3build: A testing and building system for (La)TeX
Package keytheorems: An l3keys interface to amsthm
Package koma-script: A bundle of versatile classes and packages
Package simplekv: A simple key/value system for TeX and LaTeX
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 xkeymask: An extension of xkeyval with a mask
Package ltxkeys: A robust key parser for LaTeX