Dear Per Hjort,
It is indeed possible to make your Confluence Knowledge Base publicy accessible.
You can combine this with Jira Service Desk.
You cannot however make your JIRA Service Desk Cloud publicy accessible.
There is a feature request open for this;
Users will not need a license to acces Confluence as a knowledge base, because the space in question will be made public.
You will have to create a Knowledge Base, and make it public for everyone to see.
Hello Atlassian Community! I'm Teresa, the Product Marketing Manager for Jira Service Desk Server at Atlassian. I'm excited to announce two exciting releases for Jira Service De...
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