BitNami RubyStack is a popular all-in-one package for everything that you need to get started with Ruby development in general and Rails in particular. It includes Apache, MySQL, SQLite, ImageMagick, Passenger, etc.

This new release of RubyStack includes RVM 1.13 for Linux and OS X and DevKit for Windows. RubyStack is free and can be downloaded as native installers, VMWare images or launched as Amazon Machine Images</>.