- nLiteOS: shrinks XP/Win2003 installs and lets you merge in service packs
- rt7lite: shrinks Windows 7 (and Win2008) installs and lets you merge service packs
- vLite: shrinks Vista (and Windows 7) installs
- 7Customizer: customizes Windows 7 installs
- Windows Automated Installation Kit (WAIK) for Windows 7 (neede for rt7lite and 7Customizer); use Virtual Clonedrive below so you don't have to burn this ISO to a CD to install it

Other useful links/tools:
- Virtual-Clonedrive: mounts ISO as a simulated physical CD so you can install off the ISO w/o burning a CD/DVD
- MagicISO: converts a CD into an ISO and lets you edit it
- How to use any version of Windows 7 as a trial for 120 Days (useful for VM testing)
- Direct links to Windows 7 ISOs (different service pack levels)