Permutations class for Julia.
Fixed-width integers similar to builtin ones
Entropy, Mutual Information, KL-Divergence related to Shannon's information theory and functions to binarize data
Support for Roman numerals in Julia
Ring(s) of Integers Modulo N; Polynomials; Factor Rings; etc.
replace small numbers with zero
Simple partially ordered sets for Julia
Closed intervals of the form [a,b].