The Ruby on Rails Whitepaper [Past Rubies]

This was actually released in the autumn of 2009, but was making the rounds on blogs a decade ago this week as more people discovered it. InfoEther and Mark Gardner released a very comprehensive Ruby on Rails whitepaper which covered everything from the current state of the framework, estimated developer population, to the community and ecosystem. For those of us who have been around a while or even fancy ourselves a bit of a "Ruby Historian", this is an unrivaled snapshot into the "State of Rails" in 2009.