Ruby Packaging Ecosystem As Python Terminolgies

Question

I have some experience with Ruby, but it’s less than my Python experience. I've packaged and published several Python packages, but there’s only one Ruby package I've published. I want to learn rapidly about Ruby packaging ecosystem by comparing to Python.

• I believe that there’s the tool equivalent to virtualenv in Ruby, but I don’t know what is that yet. What are the roles of RVM and Bundler?
• When I write a Python package, I usually use setup.py develop command — it resolves the dependencies but is not installed to site-packages. What is the equivalent thing in Ruby?
• What is the preferred way to make a directory layout structure of Ruby packages?
• Gem package naming rule. Is Gem name case sensitive? Should it be the same as the contained Ruby module's name?
• Any other points I missed.