Barebook
Barebook is a mini design system with a strong focus on performance, scalability, maintainability, and a small footprint.
Its architecture is based on ITCSS which is designed to aid the growth and maintainability of CSS projects. It also uses a composition of methodologies and principles such as BEM, SMACSS and OOCSS.
Barebook is a framework, but it does not give you pre-designed UI and layout, but instead, it gives you a strong and well-structured foundation on which you can build and design your own work.
But if you want to see a pre-designed UI and layout, it's extended to Barebook Design System and the code is here