From Ruby on Rails official site find the installation process and download links to all the elements to start developing with Ruby on Rails.
Free  RubyonRails
Rank: 1253
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This package includes Ruby on Rails, Apache web server, PHP and MySQL database. You can mount easily a Rails server without any configuration on a Windows system. Great for start developing.
Opensource  
Rank: 238
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RM-Install includes the most in-demand features and core requirements to produce a rock-solid enterprise-class Rails environment ready for developers and production environments.
Opensource  RubyonRails
Rank: 551 2
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Install all the elements to start running on Ruby on Rails. Soon will support also Windows.
Opensource  RubyonRails
Rank: 1419 1
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This is a simple tool to help you develop Ruby on Rails applications on Mac OS X. While those not choosing to set up their Rails development environment using Locomotive may spend hours frustrated by broken libraries, compilation errors, and incomprehensible incompatibilities, you will be able to jump right into Rails development the minute you finish downloading. Regardless of whether you are a beginner or an expert, Locomotive will save you time, reduce your stress, and eliminate (your rails installation related) exasperation.
Free  RubyonRails
Rank: 1324
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Phusion mod_rails enterprise edition.

Pay  Apache, Rails, RubyonRails
Rank: 1895
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Free  Apache, RubyonRails, Server
Rank: 763
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