Enterprise folks: what do you use for KD/How-to docs?

I work at a large enterprise where all of IT used to be outsourced, but we're just insourcing it back.

Being fairly large, we have a NOC, L3 and L4 teams, with L4 divided into different teams like Data Center and Branch networking. Unfortunately, we use SharePoint for documentation.

As all of you may know, SharePoint is great as a document repository. I haven't found it particularly useful for KB, how-to or deep architecture documentation with articles and imbedded images.

What do you use that works? (i.e. decent RBAC, team 'spaces', editing capabilities).

- Confluence? (a little concerned about the cloud licensing, but would be glad to hear)

- Anything open source? (am open to spinning up our own thing and maintaining it if needed, we have resources)

- Please don't say Sharepoint or Teams!

- Anything else?

Thanks for all the help!