Note: MultiOS-USB automatically reads the configuration and allows you to run your distribution from all compatible ISO images (GRUB loopback support = yes). This configuration is located in the ISO image in the /boot/grub/loopback.cfg file.
Below is just a list of tested and working systems. The actual number of supported systems is much larger. I can't test them all.
Where:
Boot from exFAT - Tells whether the OS supports booting from exFAT
GRUB loopback support - Tells whether the ISO supports GRUB Loopback