The Startup Way - The new book from Eric Ries, author of The Lean Startup
100 in 100 Challenge - Get 100 new paid users in 100 days
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
UI Playbook - The documented collection of UI components
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
UserInterface.io - Weekly UI/UX tips in your inbox for free