The old SimpleNLG JRuby gem - superseeded by https://github.com/jeremybmerrill/simplernlg
Chinese Whispers Clustering Plugin for Gephi (not yet compatible with 0.9 since there the Clusterer API is still temporarily missing)
Small ruby scripts to obtain graphs of GitHub user's follower relation
A tiny, MIT-licensed java implementation of the "Fleiss Kappa" measure for the inter-rater reliability of categorical ratings represented as either int or long
A minimalist JRuby module for using USB Buzz!™ controllers
Compact and simple Ruby implementations of a handful of random entries from "The On-Line Encyclopedia of Integer Sequences®"