Laws of UX - Key maxims that designers must consider when building UX
Really Good UX - A library of screenshots for UX inspiration
prodmgmt.world - Quickly find product & UX techniques to get unstuck
Startup Timelines - How the frontpages of famous startups changed over time
Checklist Design - The best UI and UX practices for production ready design.
UXTesting - Discover how your mobile users feel