Do you wanna try Ruby On Rails on OSX? Don’t you want to go crazy with command line instructions? Here you are: MacOsX Ruby on Rails installer (locomotive).
Drag-n-drop is all there is to installing Locomotive. Try Ruby on Rails without worrying about breaking your current system – it’s entirely self-contained. You can always muck around on the command line and irrevocably modify your system with a custom install later, but after trying Locomotive, most people don’t need anything more.