BartPE - Bart's PE Builder helps you build a 'BartPE' (Bart Preinstalled Environment) bootable Windows CD-Rom or DVD from the original Windows XP or Windows Server 2003 installation/setup CD, very suitable for PC maintenance tasks.
Hoek's Tools - Hoek’s Tools is a vast collection of portable utilities for the management, diagnosis and repairing of computer problems, recover lost or deleted files or cracking passwords. There are literally hundreds of utilities.
AOMEI PE Builder - Free tool to create bootable USB drive, CD/DVD or ISO file based on Windows PE.
UBCD4Win - "UBCD4Win is a bootable recovery CD that contains software used for repairing, restoring, or...
Win7PE SE - Live CD/DVD that can be built from either Windows 7 or Windows Vista sources.
MediCat USB - A multiboot Linux USB and Win10PE_x64 for PC Repair.