Anima App - Design, get feedback, convert to code, publish, iterate.
UXTesting - Discover how your mobile users feel
Sketch Repo - Collection of resources for anyone who uses Sketch
Startup Timelines - How the frontpages of famous startups changed over time
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Laws of UX - Key maxims that designers must consider when building UX