The best alternative to BartPE is WinToUSB, which is free. If that doesn't work for you, our users have ranked more than 25 alternatives to BartPE, but unfortunately only two of them are.
WinToUSB is a free software that allows you to install and run Windows operating system on a USB hard drive or USB flash drive, using an ISO image or CD/DVD drive as the source of installation. WinToUSB also support creating bootable WinPE USB drive, it can help you to transfer...
SharpBoot is a small utility for creating multiboot ISO or USB. You just need to drag-n-drop some iso files inside, and it automatically adds description and category (for supported ISO files, not shown in the screenshot). It uses Syslinux for the menu and bootloader.
