In the last 2 months in my spare time I worked for a new project, a brand new 1541 emulator for Linux.
If you want to try it: https://github.com/domenicomuti/neo1541
It is in alpha stage but it works for loading/saving prg on the vic20/c64.
It works only in Linux (for now) and it needs a parallel port with XM1541 cable.