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We're working on a CRDT collaboration engine at Outline-Wiki https://www.getoutline.com. It can be easily and performantly self-hosted (though there's a saas version available) and it's open-source.

Fair warning that it is under the Business Source License which isn't really open-source. I fully understand why this license was chosen (preventing resellers competing with your SaaS), but advertising as "open-source" is misleading.

Your FAQ also says to "Contact [You]" regarding on-prem instead of pointing to the GitHub, which imo conceals the fact that you can build and run it without a restrictive license.

I have used openkb for a while.

Its fast, lightweight and MIT licensed.

https://github.com/mrvautin/openKB

Wiki.js seems to be up and coming in this space. It’s not full featured yet, but it feels like working with a modern web application, rather than a bunch of PHP. No real time collaboration though.