Here are some of my most used apps and extensions for Google Chrome:
Adblock Plus: Blocks most annoying ads, malware, and tracking.
PushBullet: An app that links your computer with all your devices.
Pocket: Save articles, videos and more for later.
Feedly: All your favorite sites in one place.
Grammarly: Spell check and grammar check as you type online.
Bitly: URL shortening service.
Block site: Automatically blocks websites of your choice.
TrackingTime: Measure and manage time spent on projects.
Advanced REST client: Create and test custom HTTP requests.
Codota: Analyzes code snippets in web pages to show API docs.
Eye Dropper: Pick colors from web pages.
JSONView: Validate and format JSON.
Web Developer: Adds a toolbar button with various web developer tools.