Twitter Bootstrap + Google Material Design = Material Design for Bootstrap :
300+ material UI elements, 1000+ material icons, 74 CSS animations, helpers, templates, SASS files and many more.
All fully responsive. All compatible with different browsers.
Some components are commercial, but the prices for the PRO version are very affordable:
- Personal Single Site / Application : $29
- Developer Multiple Sites / Applications : $69
- Corporate Multiple Sites / Applications : $199