It looks like it's been generated by http://overviewer.org/ http://overviewer.org/, I guess they've got a cronjob or something that runs that as a script and ge

It looks like it's been generated by http://overviewer.org/ http://overviewer.org/, I guess they've got a cronjob or something that runs that as a script and generates the html and then it looks like they use an <iframe> to load the map on the page. Really cool, makes me want to start running a minecraft server again.