Startup Playbook by Hatch Quarter - A guide to building your startup
Content Marketing Stack - A curated directory of content marketing resources
On Slack by Standuply - The most extensive book on using Slack to the utmost
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
Startup Stash - A curated directory of 400 resources & tools for startups