Hashery, as the name suggests, is a collection of Hash-like classes. Many of Hashery's classes were originally part of Ruby Facets before Facets refocused on extension methods and shed most of it's add-on libraries in early 2010. Since then Hashery has refined the classes it started with, and has added a number of excellent new classes along the way.

Among Hashery's many classes are Dictionary, FuzzyHash, OpenHash, OpenCascade, OrderedHash, QueryHash, Stash and more.