Do you have any specific criticism or alternatives to Confluence? I get that you're probably venting, but I'm honestly interested in alternatives and just calling it "rubbish" or "awful" isn't useful in any way.
I like Trello, I use it all the time for personal projects, but I just don't see it scaling for large groups. I was surprised to see Unreal Engine using it[1] even if they're only using it to communicate their roadmap (and using something else internally). I thought using Trello was creative and interesting, but I have trouble actually finding and following things.
I use YouTrack at my current job. I guess it works fine for our needs, but it feels clunky and crippled compared to Jira. I'm still using 6.5 (looking to upgrade to 7), am administering it myself, and haven't read too much of the docs, but was surprised it couldn't do some things I expected when I've tried to customize it.
For ticketing systems, trello or youtrack.