Incoming Feedback by Hotjar - Instant visual feedback for your website or app!
Really Good UX - A library of screenshots for UX inspiration
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
Startup Timelines - How the frontpages of famous startups changed over time
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free
UXTesting - Discover how your mobile users feel