UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
Muzli - UI/UX and Design Inspiration Chrome Extension
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
UI Garage - Specific mobile and web design patterns for your inspiration
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
Design Hunt - Curated design inspiration for everyone