Mattias Velamsson recently shared a beginner's tutorial for making a GUI (Graphical User Interface) in Ruby titled "Ruby GUI with Glimmer". It provides a step-by-step code walkthrough that produces a full-fledged web-API-driven table-based business application. It uses various gems and APIs like glimmer-dsl-libui, dotenv, Net::HTTP, URI, JSON, and the Exchange Rates Data API. https://dev.to/smackdh/ruby-gui-with-glimmer-2fkh