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.

Appstark - Appstark is a mobile app feedback and support software.

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

ExitInput - ExitInput improves the site conversion by getting constant feedback from site visitors as they leave.

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

AppsMonk - Real time in-app chat for mobile applications.