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!

UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.

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

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

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

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.