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!

Promoter.io - Promoter is designed to capture actionable and accurate customer feedback that reduces churn and drives growth

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Delighted - The fastest and easiest way to gather actionable feedback from your customers

userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.

Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.