From: No Spam on
Reconstructor is a GNU/Linux distribution customization and creation
toolkit. It allows for the customization of the Ubuntu and Debian
GNU/Linux distributions. Customizations include boot logo image and text
color, wallpaper, themes, icons, applications, and more.
To start using Reconstructor (it's free) go to
https://build.reconstructor.org and signup.

Wiki.
https://reconstructor.org/wiki/reconstructor/