Office UI Fabric
I want to share an important and very cool open source project Office 365 & SharePoint oriented to web. This framework allow to design a layout office style and it’s absolutely responsive because onboard there is bootstrap. In this project are collaborating many people and MVP, check this link for the project: http://officeuifabric.com/ and this one for the components: http://officeuifabric.com/components/ Enjoy the UI.