Distroshare Ubuntu Imager is described as 'shell script for "re-mastering" your current installation. This means that the script creates and installable distribution for your current system. It excludes your home directory and any personal files' and is an app in the CD/DVD Tools category. There are six alternatives to Distroshare Ubuntu Imager for Linux, Online / Web-based, Ubuntu, Slax and Debian. The best alternative is Customizer, which is both free and Open Source. Other great apps like Distroshare Ubuntu Imager are penguins-eggs (Free, Open Source), Cubic (Free, Open Source), bodhibuilder (Free, Open Source) and Linux Respin (Free, Open Source).
Cubic features an integrated command line chroot environment to make the customizations and permits effortless navigation, backward and forward, through the ISO generation steps. You can create new customization projects or modify existing projects.