Winbuilder - "WinBuilder is an engine designed to build and customize boot disks (Live CDs) based on...
NTLite - The Ultimate Windows Customization Tool
AOMEI PE Builder - Free tool to create bootable USB drive, CD/DVD or ISO file based on Windows PE.
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.
Win Toolkit - BUGS: Do not post bugs in the comments.
Win8PE SE - Win8PE SE project is based on PE4 environment and will use a Windows 8 (SP0) x86 or x64 DVD.