Different types of integration tools.

1. Jenkins: Jenkins is a widely used open-source automation server that provides support for continuous integration and continuous delivery. It offers a wide range of plugins and integrations with various tools and services, and allows for custom scripting and flexibility in configuration.
   
2. Travis CI: Travis CI is a cloud-based continuous integration platform that is optimized for GitHub repositories. It offers a simple setup and configuration process, and provides integration with various deployment platforms and cloud services.
   
3. GitLab CI/CD: GitLab CI/CD is a continuous integration and delivery platform that is integrated with GitLab, a popular source code management tool. It provides a single platform for managing your code, builds, and deployments, and offers a range of features such as parallel builds, auto-scaling, and container support.
   
4. GitHub Actions: GitHub Actions is a built-in CI/CD platform that is integrated with GitHub repositories. It provides a simple and intuitive YAML-based configuration, and allows for custom scripting and automation. It also offers a wide range of integrations with various tools and services.

These are just a few examples of the many CI/CD platforms available. When choosing an alternative to CircleCI, it is important to consider factors such as ease of use, flexibility, integrations, scalability, and pricing.