You can make them public by exposing the systems to the internet and allowing "anonymous" access to the projects and spaces you wish to share (I would not recommend letting anonymous do anything other than read though)
If your product is completely open source, you could also apply for the Open Source licences for the Atlassian applications.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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