I've been working on a terminal/console based GUI framework for Ruby for around 4/5 months. Its still very basic, but there's a complimentary mp3 playing app which uses it to showcase capabilities. Not quite cross-platform, and still needs a bit of work. Welcoming pull requests.
Vedeu: https://github.com/gavinlaking/vedeu
(The mp3 player; Playa: https://github.com/gavinlaking/playa).
