Landing Pages in MailChimp - Easy to build, custom landing pages for free
Startup Playbook - Written by Sam Altman & Illustrated by Gregory Koberger
Landingfolio - The best landing page designs for your inspiration.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Landing Page Checklist - Build your landing page with these 100+ 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.