GRML is a live system based on Debian, which can be booted from various media, such as a USB stick, CD-ROM, DVD, or from a network. GRML contains a range of software packages for system administrators and users of text-based programs.
The GRML system boasts automatic hardware recognition and can be used as a rescue system for analyzing hardware and networks, or even as a working environment.
Thanks to compression, GRML provides over 2.1 GB of programs and documentation on a single CD. GRML is completely Open Source, flexible, and adaptable.
You can find more information on the project page.