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