Suggestions for ETeXcmds

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

Package forloop: Iteration in 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 footnotehyper: A hyperref aware footnote environment
Package fix2col: Fix miscellaneous two column mode features
Package gettitlestring: Clean up title references
Package inversepath: Calculate inverse file paths
Package l3keys2e: LaTeX2ε option processing using LaTeX3 keys
Package mfirstuc: Uppercase the first letter of a word
Package picture: Dimens for picture macros
Package regexpatch: High level patching of commands
Package suffix: Define commands with suffixes
Package substr: Deal with substrings in strings
Package trimspaces: Trim spaces around an argument or within a macro
Package textcase: Case conversion ignoring mathematics, etc.
Package xpatch: Extending etoolbox patching commands
Package xifthen: Extended conditional commands
Package environ: A new interface for environments in LaTeX
Package forarray: Using array structures in LaTeX
Package ifmtarg: If-then-else command for processing potentially empty arguments
Package makecmds: The new \makecommand command always (re)defines a command