Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Continua CI - Continua CI is an affordable, scaleable Continous Integration Server.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Buildbot - Python-based continuous integration testing framework
Vercel - Vercel is the platform for frontend developers, providing the speed and reliability innovators need to create at the moment of inspiration.