Muzli - UI/UX and Design Inspiration Chrome Extension
Invision - Prototyping and collaboration for design teams
UI Garage - Specific mobile and web design patterns for your inspiration
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
Design Hunt - Curated design inspiration for everyone
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.