Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
Buildbot - Python-based continuous integration testing framework
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Drone.io - Continuous Integration For GitHub and Bitbucket That Monitors Your code For Bugs