Really Good UX - A library of screenshots for UX inspiration
Validated ideas - List of 5,000 poorly executed but popular apps
UX Archive Animated - iOS apps animated user flows
The 25 Days of Ideas - Free resources for coming up with startup ideas
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
IdeasAI - OpenAI-powered startup idea generator