Aura

Original One-Page Design Doc (still good for a high level overview, with contact information. Many technical details are now obsolete)

Aura Graphics Architecture

Aura Overview

Aura and Shell dependencies

Aura Client API and Shell Separation

Layout Managers

Views

Gesture Recognizer

Ash Color Chooser (the <input type="color"> UI for ChromeOS)

Event Handling

Focus and Activation

Multi-desktop

System Tray

Immersive fullscreen - Part of the Ash window manager. Collapses the tab strip and shelf into "light bar" strips at the top and bottom of the screen.

Chrome OS lower layers (drivers/etc...)