For JIRA, see https://confluence.atlassian.com/enterprise/jira-sizing-guide-461504623.html (there's no need to worry about your agents on top of your normal users - think of them as users who do some different stuff but don't add more or less load than a normal user)
For Confluence, https://confluence.atlassian.com/doc/server-hardware-requirements-guide-30736403.html is a good start
As a Jira power user, I was at first doubtful that Trello could benefit my workflow. Jira already uses boards (ones you can customize!), so why would I even need to use Trello?! In this post you will...
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