FSX/P3D. As I understand it, this Antonov AN-24RW is an XPlane portover that is currently in beta and according to ADX reader Sean Karges, all systems are modeled and functional. He was very kind to send us some screenshots from his system and just looking at them this baby looks solid! If it's one thing I can say about the Russian flight simulation development community, these guys can really kick ass with FS addons! Especially freeware. Check it out for yourself and pop back over and let us know how she flies!!
EDIT: See comments for more info.