Invision - Prototyping and collaboration for design teams
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Swift Bootstrap - Develop iOS apps faster
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions