Startup Playbook - Written by Sam Altman & Illustrated by Gregory Koberger
Stashes - Start your own curated directory and discover awesome resources.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Mr. Free Tools - The Most Advanced Directory of Free Tools
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.
ToolSalad.com - A Curated Directory of 204+ Online Marketing Tools for Startups, Bloggers, SEOs, and Marketers.