Flat UI Pro is described as 'is made on the basis of Twitter Bootstrap in a stunning flat-style, and the kit also includes a PSD version for designers. Flat UI Pro contains a huge number of basic components, icons and glyphs'. There are more than 25 alternatives to Flat UI Pro, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Bootstrap, which is both free and Open Source. Other great sites and apps similar to Flat UI Pro are Materialize (Free, Open Source), UIkit (Free, Open Source), Semantic UI (Free, Open Source) and Purecss (Free, Open Source).
The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.
This project's goal is to be able to create a fully accessible material design styled website using React Components and Sass. With the separation of styles in Sass instead of inline styles, it should hopefully be easy to create custom components with the existing styles.