UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Incoming Feedback by Hotjar - Instant visual feedback for your website or app!
draw.io - Online diagramming application
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free