dokuwiki is nice. It's a bit different than mediawiki, so you might want to try both and compare to see which you like better.

One of the biggest differences is that Mediawiki is database-backed while dokuwiki is filesystem-backed. Another is that dokuwiki is closer to markdown syntax while mediawiki has its own more complex syntax.

Overall, dokuwiki is notably simpler and easier, but mediawiki might have some more management stuff that could be helpful if the site has lots of activity and needs more moderation.

For a lot of uses, they're pretty comparable and it would come down to preference.