Confluence
:(
:(
Confluence is a great fit for business and technical people in my experience.
2) Searching performs rather poorly in terms of the quality of results.
3) It's licensed.
4) It doesn't scale if you're doing anything more than a text repository.
5) Jira / Confluence integration is, imho, sub-par given that Atlassian makes them both.
Not an "end of the world, woe is me" story, but still ":("-worthy.
((NB: I haven't used any other wiki software, so it's possible that Confluence is far better than any other option...I hope not))
And the search is weak, I agree, but I haven't experienced any significant problems in scaling or Jira integration. It's also much more pleasant to deal with than SharePoint.
For technical-only teams, I highly recommend MoinMoin. It takes some hands on administration (maybe it's better now, I haven't used it for a couple of years) but it was worth it for the flexibility, plug-ins, and the fact that it stored pages in plain text files.