By 37 signals
About the birth of the popular framework.
Although the Rails framework is open-source, and everybody can contribute to it, Rails it was founded by no one less than the founder of 37 Signals, "David Heinemeier Hansson." He needed a rapid prototyping framework, suitable for the use of live apps in the real world..
Project Management Software
The excellent project management software produced by 37 signals is used and trusted around the world by thousands of customers is built with Ruby on Rails.
It is perfect to build new features at a rapid tempo and evolve to mature software.
Another superb use of Ruby on Rails by 37 signals is there Team Communication application integrated into Basecamp.
It makes project management so much easier if you can communicate within the same software environment.