JIRA has permissions that you can assign to users, groups, roles and specific roles in a process such as reporter and assignee. You cannot give other projects access to a project, however you can give access to the users or groups that have access to those projects. By using the permissions, you can specify that some of those users can only browse a project, meaning they can view the issues but not edit or comment on them.
BTW: do you know that you can create excellent KB articles with Confluence?
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