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
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Muzli - UI/UX and Design Inspiration Chrome Extension
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Design Hunt - Curated design inspiration for everyone