In a nutshell, Bowline lets you build cross platform desktop applications with Ruby, HTML and JavaScript. The idea is to make building desktop apps as simple (and fun) as building Rails websites.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Prevents you from data breaches and liability risks
Upgrade at your own pace
Works with modern Rubies

Bowline – A Ruby GUI framework | Lead Thinking

Rails Long Term Support