We're looking for good security and stability, versioning of some kind so changes aren't lost, ease-of-use so computer novices can comfortably edit things, and solid full-text search.
In a perfect world, we'd find one that's open source that we can host ourselves.
Does anyone have any recommendations?
If you prefer flat text files, dokuwiki which I personally use at my company and at home.
If you already are in the atlassian stack and can't escape no matter what you do, use confluence wiki. But if you don't already have any atlassian products then stay far far away.
Looks like we're going homegrown with a sqlite-backed markdown knowledge base. Hopefully open-sourcing it will prove useful to someone down the line.