Robinhood - Free stock trading service.
Richie Invest - An app that lets you invest with your friends
Trigger Finance - IFTTT for the stock market
Raiz - Invest spare change automatically from everyday purchases into a diversified portfolio.
Senate Stock Watcher - Watch how US senators trade in the stock market
Bamboo - Bamboo is a continuous integration and deployment tool that ties automated builds, tests and releases together in a single workflow.