TWO YUMMY LIBRARIES! Ruby Facets is the single largest collection of core extension methods and standard library additions available for the Ruby programming language.
R. Capra, G. Marchionini, J. Oh, F. Stutzman, and Y. Zhang. JCDL '07: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, page 442--451. New York, NY, USA, ACM, (2007)