MultiOS-USB (Unofficial)

Note: this is an unofficial app.
Caution: use it at your own risk.
Features:
BIOS and UEFI support
Secure Boot support
Load UEFI drivers
Launch .efi executable files and other bootloaders
Boot from .iso files
Boot Linux installer from network (experimental)
Automatic update configuration files
Without background services
exFAT filesystem support
Auto detect new compatible ISO images (loopback function)
Allows you to customize ISO boot menu (for example: custom kernel options)