ShareDrop, SHAREit, Syncthing, AirDrop, LocalSend, LAN-Share, BaShare, NitroShare, Warpinator, D-LAN, Feem, Roamit, LANDrop, Instashare, LanXchange, WiFi+Transfer App, ScanTransfer, LanNote, Software Data Cable, MobiKin Transfer for Mobile, p300, Fotoswipe, Transfer on LAN, Droid Over Wifi, Presto: Secure transfer with speed are some alternatives to Dukto R6.