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!

Guilded - Find, manage, and challenge gaming teams

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

Quizzly - Quizzly is a platform, for learning purposes, It gives full ability to create a small to large quizzes and to play them with your friends.

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

Houseparty - Brining empathy to online communication.