The Y Combinator Database - The definitive database of YC companies with all the metrics
Quadbot - Build your own Robot
Startup School - How to start a startup, by Y Combinator
Bitsbox - Monthly code projects for kids
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Harry Potter Kano Coding Kit - Build a wand. Learn to code. Make magic.