The Startup Way - The new book from Eric Ries, author of The Lean Startup
Teamweek - A project management software to help you get the best overview. Plan fast, change plans faster!
UI Playbook - The documented collection of UI components
Postmen - Shipping application & API for eCommerce
50 UI Tips - Improve your UI/UX skills in an hour, for free
Plecto - Plecto is a team motivation software that helps sales, customer service, and telemarketing teams increase motivation and boost performance.