AskNicely - Collect customer experience feedback on a daily basis and empower your team to take immediate action to drive retention, upgrades, reviews and referrals.
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.
Delighted - The fastest and easiest way to gather actionable feedback from your customers
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
Survicate - Collect feedback on your website and find out more about your visitors.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.