We use DokuWiki (https://www.dokuwiki.org https://www.dokuwiki.org) and it's great, but as any tool, you have to be disciplined and keep the contents up to date

We use DokuWiki (https://www.dokuwiki.org https://www.dokuwiki.org) and it's great, but as any tool, you have to be disciplined and keep the contents up to date, otherwise "wikis are where documentation goes to die." Most comments tend to cover only code comments or API documentation, but a company has way more documentation than just that: there are policies, procedures, minutes, tutorials and documentation which relates to code but does not live within it.