Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Go Forex App - #1 Forex trading learning application - trading game for beginners.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
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Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Robinhood - Free stock trading service.