Suggestions for Make-env

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

Package letter1: Letter formatting macros
Package bellmac: Outline scheme for form letter production
Package letter-plain: Letter macros for Plain TeX
Package lettermac: Simple macros for writing letters (Plain TeX)
Package context-letter: ConTeXt package for writing letters
Package envelope-letter: Draw a layout to fold the first page of a letter into its own envelope
Package iflang: Expandable checks for the current language
Package ifplatform: Conditionals to test which platform is being used
Package ifdraft: Detect draft and final class options
Package address: Generate form letters and address labels
Package block: A block letter style for the letter class
Package fullblck: Left-blocking for letter class
Package fax: Document class for preparing faxes
Package postcards: Facilitates mass-mailing of postcards (junkmail)
Package yaletter: Extremely flexible macros for letters, envelopes, and label sheets
Package cdpbundl: Business letters in the Italian style
Package envbig: Printing addresses on envelopes
Package myletter: An old letter class
Package serial: Generate serial letters
Package scrlttr2copy: A letter class option file for the automatic creation of copies
Package ifvtex: Detects use of VTeX and its facilities
Package ifluatex: Provides the \ifluatex switch
Package ifpdf: Provides the \ifpdf conditional
Package ifetex: Provides \ifetex switch
Package ifxetex: Am I running under XeTeX?
Package ifxptex: Detect pTeX and its derivatives
Package harvmac: Macros for scientific articles
Package resumemac: Plain TeX macros for resumés
Package mlawriter: Write MLA style documents in Plain TeX
Package histyle: A HighStyle environment for TeX
Package automagic: Automatic counter numbering in Plain TeX