Wiki for your department

Is there a go-to wiki documentation tool that you use in the networking department or maybe in your IT/Tech department? Which one do you use? We have the basic/standard out of date network topology documents, but I'm focusing on keeping critical documentation in a central place. As most departments do, we have problems with people updating the wrong document, keeping it to themselves, not keeping it up to date, having too many network locations/drives where multiple documents exist.

I'd like to have a central location where these documents can be entered into a single system and if the respective excel, word, visio, etc file is needed, it can be referenced via the wiki.

Ideally I'd like something free that I can install on a linux VM and access via web GUI to make changes. Since I'm doing this as a proof of concept, I don't want to look at pay options unless there is a somewhat reasonable amount of time that I can run it in 'free' mode. Before I present this to the department, I'd like to have content loaded in the wiki page(s).

Some things I'd like to have are:

• multiple accounts to allow certain users to edit, everyone else should be read-only
• searchable (I'm sure they all are, but making sure this is listed as on option for obvious reasons, the ability to search is needed)
• option to export a page/article/etc as a PDF (if printing as a PDF doesn't properly format the page)

I'm hoping there is a known go-to option that can be recommended. I'm going through the google results, now, for 'top 5 wiki tools', etc... but would also like to see if any of those line up with what is actively being used by users of this sub. For example, when I see posts asking about IP Address management, the same few programs are recommended, I'm hoping the same is true for a wiki style tool.

Thanks.