100 UI/UX Tips - This is a collection of Dos and Dont's for making your UI better.
Incoming Feedback by Hotjar - Instant visual feedback for your website or app!
100 days of SEO - An actionable SEO tip to your inbox each day
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
UserInterface.io - Weekly UI/UX tips in your inbox for free
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free