The Startup Way - The new book from Eric Ries, author of The Lean Startup
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
UI Playbook - The documented collection of UI components
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
50 UI Tips - Improve your UI/UX skills in an hour, for free
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.