Suggestions for IfTeX

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

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 ifptex: Check if the engine is pTeX or one of its derivatives
Package tex-locale: Localisation support for TeX and LaTeX documents
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 ltxcmds: Some LaTeX kernel commands for general use
Package namedef: TeX definitions with named parameters
Package pdftexcmds: LuaTeX support for pdfTeX utility functions
Package collargs: Collect arguments of any command
Package hologo: A collection of logos with bookmark support
Package luakeys: A Lua module for parsing key-value options
Package youngtab: Typeset Young-Tableaux
Package tuple: Expandable operations for tuples of numbers
Package advice: Extend commands and environments
Package lparse: Parse macro arguments with Lua using xparse-like specification
Package expkv-bundle: An expandable key=val implementation and friends
Package polexpr: A parser for polynomial expressions
Package witharrows: Aligned math environments with arrows for comments
Package luatexja: Typeset Japanese with Lua(La)TeX
Package schemata: Print topical diagrams
Package chemfig: Draw molecules with easy syntax
Package memoize: Externalization of graphics and memoization of compilation results in general
Package localloc: Macros for localizing TeX register allocations
Package tokmap: Iterate over a token list expandably, without dropping spaces or braced groups
Package plainpkg: A minimal method for making generic packages