Imre Széll from Hungary (aka 'siz') has ported d64it to the Plus/4.
I've recently done a vic20 version of d64it, so now you can extract d64's (or create them) natively on your trusty (rusty?) old vic 20! It needs a vic with 8k or more of expansion ram.
D64it is a simple program for the c64 to convert from .D64 files (emulator disk images) to a 1541 disk or vice-versa. It's slow but it works!
Of course to use it you need a device on the c64 that can hold a ~170k D64 file (eg 1581, Ramdisk/REU, CMD FD/HD etc).
Also available is d128it, which is a native 128 version of d64it (derr..). Works nicely with fast serial devices..
NEW - d64it-vic is a d64it for the vic20! Requires 8k+ of expansion ram to run.