Robinhood - Free stock trading service.
Goodreads - See what your friends are reading.
Scout Finance - Free finance app that's like having a Bloomberg in your pocket. Download:
LibraryThing - A home for your books.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.