Elementary OS Luna beta (based on Ubuntu LTS (http://elementaryos.org), "rbenv" as ruby version manager (https://github.com/sstephenson/rbenv), "bundler" as gem packages manager (http://bundler.io), Sublime Text and vim as code editor (http://www.sublimetext.com) and SQlite as developement database (or simply install PostgreSQL or MySQL throught apt-get package manager)