Startup Playbook - Written by Sam Altman & Illustrated by Gregory Koberger

Moleskine Smart Notebook - Turn hand-drawn sketches into fully workable vector files

Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.

Action Method Notebooks - Notebooks for making ideas happen

Founder Institute - Since 2009, the world’s fastest-growing startups have used the Founder Institute to raise funding, get into seed-accelerators, generate traction, and more.

Notebook.ai - A smart notebook that grows and collaborates with you