Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
JetBrains TeamCity - TeamCity is a continuous integration and build management system.
ElectricFlow Build-Test - Information about ElectricFlow Build-Test including independent reviews; ratings. Comparisons; alternatives to ElectricFlow Build-Test from other Build Automation
Agola - A selfhosted open source CI/CD server build around the git workflow.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.