I use Confluence for my day job (since we already had Jira, bleh), and it mostly gets the job done:

- User editable wiki pages

- Page history / revision diffs

- hierarchical organization

However, their cloud service is pretty slow, the whole thing feels clunky, and I'm not going to pay for it for my personal or small team projects.

What other options are there? I had used Github wiki pages (private repo) for a while, but that became unwieldy without any kind of real organizational mechanisms (manually building a tree of links on the home wiki page does not count). I don't really want to use that for my current project.

I could try Google Docs but that also feels wrong to me; I want a single clean location for documents pertaining exclusively to a certain project, with a tree of the contents.

There are other features I'd like to have for this:

- Realtime collaboration (obvs Docs has this and supposedly the next version of Confluence will)

- Easy way to make certain documents/folders publicly accessible (i.e. Knowledge Base), possibly with integrations, i.e. ZenDesk

- Slack integration: post to channel when certain documents are changed with a diff summary

Is this an opportunity for a new tool?