Do you know if there's any add-ons for free that would allow me to create wikis on JIRA (onDemand)? I found the "Content Formatting Macros", but seems like it's not updated and doesn't work anymore.
Jira is an issue tracker, not a wiki. It's got some basic text formatting in some it's fields, but everything belongs to issues.
You might want to take a look at Confluence, which is the Wiki software Atlassian does - it integrates well with Jira (more tightly with every release) and is available to OnDemand users alongside Jira
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