Startup Playbook by Hatch Quarter - A guide to building your startup
YC Startup Class - A live, one-hour class by Sam Altman on Platzi
On Slack by Standuply - The most extensive book on using Slack to the utmost
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
Radiohere - Hand curated multi lingual online radio stations
How to build muscle - An engineer's guide to building muscle.