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Both versions ship the latest versions of the most popular components: Apache 2.2.21, MySQL 5.5.16, NGinx 1.0.10, Subversion 1.7.1, Git 1.7.8, PHP 5.3.8 among other components. The primary difference between the two versions are the Ruby and Rails versions included:
RubyStack 3.1.3 version ships Ruby 1.9.3-p0 and Rails 3.1.3.
RubyStack 2.3.14 version includes Ruby 1.8.7-p334 and Rails 2.3.14.
We have also released an up-to-date quick start guide in PDF where you can learn how to create your own Ruby On Rails project on top of this BitNami Stack.