Continuous Delivery Tools Resources

Yes, in that for non-commercial users, payment is unnecessary. Additionally, its source is publicly available.

Jenkins is the open source automation server used for CI/CD while Cloud Bees is a Company that offers enterprise solution and service around Jenkins and other CI/CD tools to help organizations with their software development and delivery process.

In a DevOps environment, TeamCity helps automate the build, test, and deployment processes. When you push a new feature or update a dependency in a version control system, TeamCity automatically runs the CI/CD pipeline. You and your team can see the build progress in real time and be notified of the build results inside your IDE, by email, in Slack, or via other channels.