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GoblinBot4 is a vandalism reversion bot. It patrols New Changes for edits that meet a pre-defined set of rules, and if they do it reverts and warns the user. It also reports users to Wikipedia:Vandalism in progress/Bot if they vandalise after a final warning, and it also tags pages for QD if they meet that criteria, again determined in the bot's code.
The bot's code can be found on SourceForge, though it is currently only available via Subversion (SVN).
If you would like to request new features, report bugs, new vandalism patterns or anything else, please use the JIRA project on the Wikimedia Toolserver.