About 8 months ago we announced the Universal Package Manager -- a package manager with the same frontend despite language differences. We launched it with Python, NodeJS, HTML, and Web Frameworks support.
Now, we're going back and adding more languages to it. Starting with the wonderful RubyGems. You'll see the package 📦icon in the sidebar for Ruby and will be able to install Gems to your repl.
Start here. Happy rubying!