Suggestions for texdimens

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

Package units: Typeset units
Package chemfig: Draw molecules with easy syntax
Package polexpr: A parser for polynomial expressions
Package yax: Yet Another Key System
Package siunitx: A comprehensive (SI) units package
Package nicefrac: Typeset in-line fractions in a nice way
Package bxcalc: Extend the functionality of the calc package
Package etoc: Completely customisable TOCs
Package etex-pkg: ε-TeX support package
Package xskak: An extension to the skak package for chess typesetting
Package scrbase: Provide basic features for KOMA-Script
Package csquotes: Context sensitive quotation facilities
Package etoolbox: ε-TeX tools for LaTeX
Package eoldef: Define commands which absorb the whole source line as arguments
Package texapi: Macros to write format-independent packages
Package etoolbox-generic: A loader for etoolbox.sty in non-LaTeX formats
Package hyperref: Extensive support for hypertext in LaTeX
Package visualtoks: Typeset TeXbook-style visualisations of token lists
Package cooking-units: Typeset and convert units for cookery books and recipes
Package non-decimal-units: Display and manipulate historical non-decimal units
Package ifvtex: Detects use of VTeX and its facilities
Package ifluatex: Provides the \ifluatex switch
Package nth: Generate English ordinal numbers
Package ifpdf: Provides the \ifpdf conditional
Package ifetex: Provides \ifetex switch
Package ctablestack: Catcode table stable support
Package expex: Linguistic examples and glosses, with reference capabilities
Package ifxetex: Am I running under XeTeX?
Package luatexbase: Basic resource management for LuaTeX code
Package multido: A loop facility for Generic TeX
Package multiexpand: Variations on the primitive command \expandafter