Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Nifty - Manage projects, work, and communications in one place.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Intercom on Product Management - The ultimate resource for aspiring product managers