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[dmitri]

Single editor or multiple editors? Database backend? Revisions?

Multiple editors, mysql backend, revisions is a plus.

[fuzzysnuggleduck]

Single editor or multiple editors? Database backend? Revisions?

Multiple editors, mysql backend, revisions is a plus.

MediaWiki would probably be a good choice then.

http://www.mediawiki.org/wiki/MediaWiki

[dm9876]

I use DokuWiki, it has no need for database but still excellent performance / multi user / revisions etc

http://www.dokuwiki.org/dokuwiki

http://en.wikipedia.org/wiki/Dokuwiki

I find it much easier to maintain and use than MediaWiki.

Feature comparison of DokuWiki + MediaWiki: http://www.wikimatrix.org/compare/DokuWiki+MediaWiki

It is mature well maintained and has a large user base. Also with lots of plugins for additional functionality etc.

It is PHP based, and since you are using phpBB I guess that is ok