http://dennylindberg.com/downloads/axtended/

http://wiki.beyondunreal.com/UE3:Projectile_%28UDK%29

http://www.olde-bijvank.nl/index.php?option=com_content&view=article&id=43&Itemid=82

http://forums.epicgames.com/showthread.php?p=27065806#post27065806