Suggestions for pdftexcmds
The following packages have something in common with the package pdftexcmds. The packages are ordered in decreasing similarity.
- plainpkg: A minimal method for making generic packages
 - localloc: Macros for localizing TeX register allocations
 - ltxcmds: Some LaTeX kernel commands for general use
 - collargs: Collect arguments of any command
 - etoolbox-generic: A loader for etoolbox.sty in non-LaTeX formats
 - advice: Extend commands and environments
 - catcodes: Generic handling of TeX category codes
 - expkv-cs: Define expandable key=val macros using expkv
 - expkv-bundle: An expandable key=val implementation and friends
 - tokmap: Iterate over a token list expandably, without dropping spaces or braced groups
 - tokcycle: Build tools to process tokens from an input stream
 - langcode: Simple language-dependent settings based on language codes
 - fltpoint: Simple floating point arithmetic
 - hologo: A collection of logos with bookmark support
 - calcfrac: Calculates the value of an expression containing fractions
 - iftex: Am I running under pdfTeX, XeTeX or LuaTeX?
 - youngtab: Typeset Young-Tableaux
 - addtoluatexpath: Add paths to Lua packages and input TeX files
 - lua-visual-debug: Visual debugging with LuaLaTeX
 - namedef: TeX definitions with named parameters
 - visualtoks: Typeset TeXbook-style visualisations of token lists
 - polexpr: A parser for polynomial expressions
 - pdfmsym: PDF Math Symbols — various drawn mathematical symbols
 - expex-acro: Wrapper for the expex package
 - opbible: Creating a study Bible with OpTeX
 - chinese-jfm: Luatexja-jfm files for Chinese typesetting
 - tuple: Expandable operations for tuples of numbers
 - stretchy: Macros for creating stretchy TeX symbols
 - luakeys: A Lua module for parsing key-value options
 - schemata: Print topical diagrams
 - luatexja: Typeset Japanese with Lua(La)TeX