Suggestions for catoptions

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

• skeycommand: Create commands using parameters and keyval in parallel
• l3keys2e: LaTeX2ε option processing using LaTeX3 keys
• pgfopts: LaTeX package options with pgfkeys
• expkv-bundle: An expandable key=val implementation and friends
• expkv-cs: Define expandable key=val macros using expkv
• options: Provides convenient key-value options for LaTeX package writers
• keycommand: Simple creation of commands with key-value arguments
• keyreader: A robust interface to xkeyval
• keyval2e: A lightweight and robust key-value parser
• ltxkeys: A robust key parser for LaTeX
• pgfkeyx: Extended and more robust version of pgfkeys
• skeyval: Key-value parsing combining features of xkeyval and pgfkeys
• kvoptions: Key value format for package options
• xkeyval: Extension of the keyval package
• kvsetkeys: Key value parser with default handler support
• clefval: Key/value support with a hash
• kvdefinekeys: Define keys for use in the kvsetkeys package
• xkeymask: An extension of xkeyval with a mask
• pgfkeysearch: This package offers a way to find keys in a given path 'recursively', unlike pgfkeysvalueof
• pst-xkey: Key-value syntax for PSTricks packages
• scrbase: Provide basic features for KOMA-Script
• forloop: Iteration in LaTeX
• cdcmd: Expandable conditional commands for LaTeX
• lambdax: Use Lambda expression within LaTeX
• enverb: Read an environment verbatim
• ifnextok: Utility macro: peek ahead without ignoring spaces
• arraysort: Sort arrays (or portions of them)
• conv-xkv: Create new key-value syntax
• fetchcls: Fetch the current class name
• multidef: Quickly define several similar macros
• at: Short commands starting '@'