Suggestions for Comment-pln

The following packages have something in common with the package Comment-pln. The packages are ordered in decreasing similarity.

Package phfcc: Convenient inline commenting in collaborative documents
Package comment: Selectively include/exclude portions of text
Package optional: Facilitate optional printing of parts of a document
Package to-be-determined: Highlight text passages that need further work
Package maybeload: Prevent reloading of files
Package luacensor: Securely redact sensitive information using Lua
Package codesection: Provides an environment that may be conditionally included
Package conditext: Define and manage conditional content
Package renditions: Multiple versions from the same content
Package hideanswer: Generate documents with and without answers by toggling a switch
Package chbar: Change bar marks in Plain TeX
Package graphicscache: Cache includegraphics calls
Package ifallfalse: Compare a string against a set of other strings
Package multiaudience: Several versions of output from the same source
Package switch: A constant time/expandable switch/case
Package tagging: Document configuration with tags
Package version: Conditionally include text
Package xifthen: Extended conditional commands
Package xcomment: Allows selected environments to be included/excluded
Package ifthenx: Extra tests for \ifthenelse
Package versions: Optionally omit pieces of text
Package makegobbler: Keep or drop some part of LaTeX source code
Package draftfigure: Replace figures with a white box and additional features
Package annotation-pkg: Suppress or permit annotations to a document
Package chgbar: Draw change bars in the margin
Package draft: A LaTeX 2.09 style for supporting work on drafts
Package editbar: Change bars for LaTeX 2.09
Package marnote: Place text in the margin of a document
Package unfinished: Mark unfinished parts of a document
Package drafthead: Mark DRAFT in page headers
Package memoize-ext: Extended support for memoization with Memoize