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RubyMine is a nice Ruby-centric IDE. It includes a lot of features that are peripheral to Ruby itself, including support for Rails, git, Sass, HAML, Slim, and CoffeeScript.
While many Rubyists don't like IDEs, this is probably the most acceptable IDE for Ruby, by far.
RUBYMINE_VERSION='4.5.4' # Download the DMG file. wget http://download.jetbrains.com/ruby/RubyMine-$RUBYMINE_VERSION.dmg # Mount the DMG file. hdiutil attach RubyMine-$RUBYMINE_VERSION.dmg # Copy the app file into the Applications folder. cp -a /Volumes/RubyMine/RubyMine.app /Applications/ # Unmount the DMG file. hdiutil detach /Volumes/RubyMine # Add a dock icon. dockutil --add /Applications/RubyMine.app # Delete the download. rm RubyMine-$RUBYMINE_VERSION.dmg