What are some alternatives?
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Buildkite - Buildkite is a platform for running fast, secure, and scalable continuous integration pipelines on your own infrastructure.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
DeployHQ - Avatar for @foamcow. I've got so used to how handy DeployHQ is that I'm finding I want a quicker way than logging in and pressing the green button. @foamcow · Avatar for @LoudBicycle.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
xinc - PHP Continuous Integration and Control Server