Couldn't disagree more on the integrated wiki point. Issue trackers with integrated documentation pages (wikis or otherwise) make it really straightforward to g

Couldn't disagree more on the integrated wiki point. Issue trackers with integrated documentation pages (wikis or otherwise) make it really straightforward to generate docs as a byproduct of working on tickets, or to resolve support requests by linking to the docs. Eventually you will want an external documentation tool, but Atlassian doesn't have one that's any good (Confluence is by far the worst wiki-like application I have ever used).