This project rocks and uses MIT-LICENSE.
Ui Bibz
Ui Bibz is an Ui framework that allows you to build an interface very quickly and simply using Ruby on Rails 6 and Boostrap 5.
Ui Bibz load Bootstrap and Font Awesome.
Documentation
Full documentation is here with bootstrap 5: Ui Bibz v3
Older documentation is here with bootstrap 4: Ui Bibz v2.5