Sinatra is an open source framework in Ruby. It is a domain-specific language that aims to accelerate web application development. Sinatra 1.3.0 version offers the feature of a streaming API while digesting differences between evented and sequential Rack servers. To imagine the possibilities of development, readers should consider that Apple, BBC, LinkedIn, and GitHub are some of the companies that use Sinatra. A book written by Alan Harris and Konstantin Haase, "Sinatra: up and running" is available for purchase. This resource contains additional information related to installation, routing, application/delegation, modular applications, and implementation of a blog engine.