Balto - Easy feedback with screenshot / videos for your beta apps
Really Good UX - A library of screenshots for UX inspiration
SessionStack - Record and replay web app issues. See them the way they happened to end users.
Startup Timelines - How the frontpages of famous startups changed over time
Video Contact Forms by Typeform - Get 10x more personal with your site's visitors from Day 1
UXTesting - Discover how your mobile users feel