Robinhood - Free stock trading service.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Richie Invest - An app that lets you invest with your friends
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Raiz - Invest spare change automatically from everyday purchases into a diversified portfolio.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.