FeedBear - The smartest way to manage 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
YesInsights - Get Customer feedback with simple one-click or NPS surveys
Maian Support - Free responsive PHP Helpdesk System
Lookback Live - Real-time user research on mobile and desktop 🕵 ✍️
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.