Leaf is a CSS framework based on google’s material design.
Geo is a timeless theme built for Twitter Bootstrap using Bootswatch.
Paradeiser is a css only mobile navigation menu with no js required and it is only 1.3kb.
Skyline helps to build custom CSS framework for your website. it comes with a great CSS architecture and enables to develop reusable codebase.
With ChocolateChip-UI you can build Web and mobile apps with native look you can give it away for free. ChocolateChip-UI is fast Easy and Customizable.
Ratchet helps you build mobile apps with simple HTML‚ CSS‚ and JS components.
Lemonade is a easy to customize grid system. It supports Chrome, Firefox, Opera, Safari and IE. Lemonade also supports major phone devices.
Octicons – Free Icon font by Github.