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• Puppet is written in Ruby. (So is Chef).

From Luke Kanies, Puppet creator:

“I was a sysadmin by trade and had mostly developed in perl, but when I tried to write the prototype I had in mind, I couldn’t get the class relationships I wanted in perl. I tried Python, because this was around 2003 and Python was the next new thing and everyone was saying how great it is, but I just can’t seem to write in Python at all. A friend had said he’d heard Ruby was cool, so I gave it a try, and in four hours I went from never having seen a line of it to having a working prototype. I haven’t looked back since then, and haven’t regretted the choice.” Fair Use Source: https://stackoverflow.com/questions/16727224/why-do-puppet-and-chef-use-ruby

Chef

Ruby on Rails (RoR)