Bootstrap Zero - Open-source, free Bootstrap templates collection.
Storefront UI - The first Vue.js UI library dedicated to eCommerce
Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
eCommerce HTML - Bootstrap 5 HTML eCommerce UI Kit
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.