Incoming Feedback by Hotjar - Instant visual feedback for your website or app!
Wootric - Wootric is software that allows apps and websites to take customer satisfaction surveys so that you can properly gauge the popularity and success of your app through the eyes of the people using it. Read more about Wootric.
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
TinyNPS - Simple NPS feedback
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free
Customerville - Net Promoter Scores on steriods