Feedbackify - Feedbackify offers website feedback solutions that enable companies to engage with their customers.
1Flow - The leading in-app survey platform for mobile apps and websites to collect in-the-moment user feedback. Measure NPS, CSAT, CES, and PMF scores and gather feature-specific user feedback to improve your product.
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Usabilla Visual Survey - Gather feedback at any stage of the design process.
Userlike - Userlike is free live chat software for website and mobile support.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.