One quite interesting use of Ruby outside of Rails was its inclusion as the scripting language in various versions of RPG Maker, a popular piece of game creatio

One quite interesting use of Ruby outside of Rails was its inclusion as the scripting language in various versions of RPG Maker, a popular piece of game creation software. The developers of the software are Japanese, like Yukihiro Matsumoto, and I gather Ruby is used in broader situations in Japan than Rails.