LiveSession - LiveSession helps you analyze users’ behavior, improve UX, find JS bugs, and increase conversion rates using session replays, and event-based product analytics.
Really Good UX - A library of screenshots for UX inspiration
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
Startup Timelines - How the frontpages of famous startups changed over time
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
UXTesting - Discover how your mobile users feel