Suggestions for xargs

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

Package l3keys2e: LaTeX2ε option processing using LaTeX3 keys
Package etl: Expandable token list operations
Package l3experimental: Experimental LaTeX3 concepts
Package expl3: Wrapper package for experimental LaTeX3
Package zhlipsum: Chinese dummy text
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 functional: An intuitive functional programming interface for LaTeX2
Package l3packages: High-level LaTeX3 concepts
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 unravel: Watching TeX digest tokens
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
Package twoopt: Definitions with two optional arguments
Package authoraftertitle: Make author, etc., available after \maketitle
Package aliascnt: Alias counters
Package catchfile: Catch an external file into a macro
Package chngcntr: Change the resetting of counters
Package duckuments: Create duckified dummy content
Package elocalloc: Local allocation macros for LaTeX 2015
Package etex-pkg: ε-TeX support package
Package etexcmds: Avoid name clashes with ε-TeX commands
Package footnotehyper: A hyperref aware footnote environment
Package fix2col: Fix miscellaneous two column mode features
Package gettitlestring: Clean up title references