Startup School - How to start a startup, by Y Combinator
Codespace - A beautiful cross-platform code snippet manager
The Y Combinator Database - The definitive database of YC companies with all the metrics
Snipper.ml - A simple snippet manager in the menubar
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
CodeMyUI - Handpicked code snippets you can use in your web projects