Checklist Design - The best UI and UX practices for production ready design.
UI & UX Checklist - Learn, practice & check UI UX laws on a Notion template
UserInterface.io - Weekly UI/UX tips in your inbox for free
UXsniff - Track user behavior on your website and improve conversions with UXsniff: the user experience watchdog that looks out for you.
pttrns - iPhone and iPad user interface patterns
uEye - uEye is free, fun, and an interactive way to learn UI design.