UX Archive Animated - iOS apps animated user flows
Usability.gov - Resource for user experience (UX) best practices & guides
Page Flows - User flow design inspiration for mobile & desktop
UX Check - Easy heuristic evaluations on your website (chrome ext.)
UI Patterns - Level up with interactive mobile design patterns
Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.