Suggestions for enparen

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

Package bracealign: Align braces under and over math expressions
Package embrac: Upright brackets in emphasised text
Package interval: Format mathematical intervals, ensuring proper spacing
Package stampinclude: Inclusion based on .aux file date stamps
Package dynbrackets: Commands to simplify the syntax of dynamic math brackets
Package phfparen: Parenthetic math expressions made simpler and less redundant
Package rainbowbrackets: Automatic coloring of nested parentheses
Package longmath: Nested delimiter groups extending over multiple array cells or lines
Package ibrackets: Intelligent brackets
Package perfectcut: Nested delimiters that consistently grow regardless of the contents
Package hypgotoe: Links to embedded files
Package eolgrab: Catch arguments delimited by end of line
Package flags: Setting and clearing of flags in bit fields
Package bmpsize: Extract size and resolution data from bitmap files
Package chemarr: Arrows for chemists
Package hyphsubst: Substitute hyphenation patterns
Package engord: Converts numbers to English ordinal numbers
Package hypbmsec: Hypertext bookmarks in sectioning commands
Package fibnum: Generate Fibonacci numbers
Package centernot: Centred \not command
Package iflang: Expandable checks for the current language
Package resizegather: Automatically resize overly large equations
Package rotchiffre: Perform simple rotation cyphers
Package stackrel: Enhancement to the \stackrel command
Package thepdfnumber: Print PDF numbers with minimal digits
Package twoopt: Definitions with two optional arguments
Package settobox: Assigning dimensions of a box to a length register
Package setouterhbox: Set hbox in outer horizontal mode
Package ifdraft: Detect draft and final class options
Package pdfcolparcolumns: Fix colour problems in package parcolumns
Package pdfcolparallel: Fix colour problems in package parallel