Developer Tools/Installation Builders
freeware
A Bootable USB
A Bootable USB will create bootable USB drives from Windows ISO or a folder that contains Windows installation files.
open source
NSIS (Nullsoft Scriptable Install System)
NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution.