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.

Feedback Tools - Curated directory of tools for getting all the feedback

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

ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.

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

Incoming Feedback by Hotjar - Instant visual feedback for your website or app!