Glimmer DSL for Opal v0.3.0 is out with Custom Widget and Custom Shell support, allowing developers to webify their pure Ruby desktop apps with Opal on Rails without changing a line of code. New custom shell support enables launching windows (opening browser tabs) from a GUI just like opening windows in a desktop app. Routing is handled automatically so that developers can keep focusing on business GUI details. https://andymaleh.blogspot.com/2020/10/glimmer-dsl-for-opal-v030-custom-shell.html