YC Startup Class - A live, one-hour class by Sam Altman on Platzi
TiddlyMap - An interactive concept- and mind-mapping plugin for the personal note-taking software TiddlyWiki based on the Vis.js library. It's free and open-source!
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
Wisdomap - Wisdomap Medicine is a study aid that helps medical students create differential diagnoses and suitable management plans from a presenting complaint and structured revision notes.
Radiohere - Hand curated multi lingual online radio stations
IOctopus - IOctopus is an online mind map service for a dive deep into the mind for the best ideas.