ithinki - A simple user feedback tool for start-ups
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free
Herald - Bridge the gap between customer problems and product teams
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
FeedBear - The smartest way to manage feedback from your customers
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.