Suggestions for dow

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

Package calendarweek: Calculate the week number of a date
Package trigonometry: Demonstration code for cos and sin in TeX macros
Package apnum: Arbitrary precision numbers implemented by TeX macros
Package modulus: A non-destructive modulus and integer quotient operator for TeX
Package realcalc: Macros for real arithmetic calculations
Package random: Generating random numbers in TeX
Package xint: Expandable arbitrary precision floating point and integer operations
Package calcfrac: Calculates the value of an expression containing fractions
Package fltpoint: Simple floating point arithmetic
Package minifp: Fixed-point real computations to 8 decimals
Package poormanlog: Logarithms and powers with (almost) 9 digits
Package zeckendorf: Knuth Fibonacci multiplication, Zeckendorf and Bergman representations of big integers
Package pi: Calculate pi
Package sines: Calculate sin function values
Package calorie: Track calorie content in documents
Package xlop: Calculates and displays arithmetic operations
Package tuple: Expandable operations for tuples of numbers
Package ruler: A typographic ruler for TeX
Package olsak-misc: Collection of plain TeX macros written by Petr Olšák
Package arabic: Read a lower-case roman number
Package backgrnd: Mark text with grey background or change bar
Package emtrees: Draw labelled trees, using emTeX \specials
Package fakebold: A simple macro for faking bold fonts
Package hep-gen: Generic macros for quantum physics
Package longdiv: Long division arithmetic problems
Package letterspacing: Letter spacing
Package outerhbox: Collect horizontal material for contributing to a paragraph
Package ragged: Generic ragged left and ragged right options
Package swrule: Lines thicker in the middle than at the ends
Package undertilde-gen: A simple macro for placing a tilde under a character
Package verbatim-gen: Generic macros for setting text verbatim