serverlist.json - Old standard version.
serverlist_v2.json - Standard version, compatible with Light's feed.
serverlist.xml - Output almost compatible with the old Crazy Tronners feed, or if you just perfer XML
serverlist.xml.php - The previous, but with servers age replaced with seconds since last update instead of timestamp of update, makes it more compatible with CT's old feed at the cost of speed
serverlist.rss - Parsable by RSS readers