UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Mobbin - Latest mobile design patterns & elements library
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
pttrns - iPhone and iPad user interface patterns
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Page Flows - User flow design inspiration for mobile & desktop