What programs do you know for transferring files over the network without registration?

Question

Software and Internet Services

What programs do you know for transferring files over the network? so that they are not resource-intensive, without registration, as in ICQ, for example, and so that the window about transferring files to the foreground to the user is thrown out - about the fact that I want to transfer the file, for example: accept the file from ....)

Answer 1

bittorent sync and its analogues

Answer 2

sourceforge.net/projects/lanmsngr