Filecommander (Norton-Commander-Clone) for SAP-Systems (ABAP)
Too good to be forgotten...
You can switch right and left sides between application server, front-end, or an RFC destination (a different app.server):
SAP ECC Release 731
Original by Achim von Lowtzow
https://code.google.com/archive/p/sapcommander/
Also have look at ZAL11