Really Good UX - A library of screenshots for UX inspiration
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.)
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.