The 1.3 version of Docker Terminal for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Developer Tools, more precisely IDE. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally designed by Docker.
From the developer:
Docker allows you to package an application with all of its dependencies into a standardized unit for software development.
Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in.
You may want to check out more software for Mac, such as Docker Cloud, Docker Hub or Terminal Here, which might be similar to Docker Terminal.