github.com USB Mountr Alternatives

Install Windows from USB with WinSetupFromUSB, multiboot and a lot more

Rufus is a piece of software that allows you to transform a portable drive, like a flash drive or other USB drives, into a bootable drive that can be used for a variety of purposes. Read more about Rufus.

Open Source

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YUMI (Your USB Multiboot Installer), is a tool that allows you to boot multiple ISO files from one USB drive.

Flash OS images to SD cards & USB drives, safely and easily.

UNetbootin is a utility for creating live bootable USB drives. The name of the software is short for Universal Netboot Installer, and its most prevalent use has been to create bootable versions of Linux distributions on a USB drive.

Open Source

PowerISO is a virtual drive that allows users to encode, burn, mount, and even encrypt CDs, DVDs, and BDs. The software can be downloaded from many platforms and sites online.

Flexible and configurable USB drive multiboot solution which also supports UEFI booting.

free

DriveDroid allows you to boot your PC from ISO/IMG files stored on your phone.

Make your USB drive bootable by using RMPrepUSB

Universal USB Installer aka UUI is a Live Linux Bootable USB Creator that allows you to choose from a selection …

Ventoy is an open source tool to create bootable USB drive for ISO files.

Open Source

A Windows Disk Imager. A C#.NET utility for reading / writing SD cards and USB devices

Pardus Image Writer is a tool to create bootable usb drives.