UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
UI Garage - Specific mobile and web design patterns for your inspiration
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Muzli - UI/UX and Design Inspiration Chrome Extension
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Design Hunt - Curated design inspiration for everyone