nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Rack::Cache is a component to enable HTTP caching for Rack-based applications such as Rails.
GoDaddy email provides a personalized address but protection against viruses and spam and includes tools like Calendar.
Typekit is the easiest way to use real fonts on the web. It's a subscription-based service for linking to high-quality Open Type fonts from some of the worlds best type foundries.