MultiBoot program that works?

I’m trying to build a multiboot USB with several Linux distros on it - no windows -for exploration’s sake.
Nothing I’ve tried in Linux has worked, not even Yumi in Wine.

But I have borrowed an old Windows 8 laptop and Yumi seems to be able to do it there, although it keeps choking on openSUSE for some reason.

I am most definitely going to check out that DriveDroid, thanks, Misko_2083