MP3 Player written in Ruby using Ruby on Rails
I wrote a simple MP3 player:
https://github.com/gdonald/player
Console Blackjack in Ruby
I wrote a Console version of Blackjack in Ruby.
CRM12 - Customer relationship management software
I wrote a customer relationship management tool in Ruby on Rails:
You can manage customers, sales, and products. It also has custom fields you can attach to products.