Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
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.
CruiseControl.rb - CruiseControl.rb is a continuous integration tool.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
Vercel - Vercel is the platform for frontend developers, providing the speed and reliability innovators need to create at the moment of inspiration.