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!
Usersnap - Visual Feedback - Usersnap helps your business with its versatile feedback platform to build better, more successful products and services with the help of user feedback. Collect feedback along your product development lifecycle. Try it for free.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Tweakr.io - The fastest way to get visual feedback 📌
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.