Extension:SimpleAntiSpam

SimpleAntiSpam extension adds a hidden form field to the edit page as an anti-spam/anti-bot check. If the field is not blank when the page is saved, the save will be aborted and a generic "you triggered the spam filter" page will be shown.

MediaWiki-attacking bots will rarely be cheated so easily, but this helps defeating at least the simplest forms of general-purpose spambots not designed for MediaWiki.