The Startup Way - The new book from Eric Ries, author of The Lean Startup
UI Playbook - The documented collection of UI components
Teamweek - A project management software to help you get the best overview. Plan fast, change plans faster!
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Postmen - Shipping application & API for eCommerce
UserInterface.io - Weekly UI/UX tips in your inbox for free