From Lundman Software:
UFxp is one of the clients that uses the FXP. One FTP/FXP engine. Currently uses X11/Ultimate++ build, but native support is coming. Universal build. FXP.One engine separates the FTP/FXP code to the GUI clients. You can setup your transfer queues with one client, connect back with a different client on a different OS, to check on progress, make changes. Supports SSL, XDUPE, PRET, SSCN, CCSN etc etc.