Slax is my favorite Live CD running Linux because it is so easy to customize into your own Live
CD Open Source PC tool kit. I have created several of these over the years and continue to enjoy creating customized Live CDs. I even have one, I call OS-PCTools, which I distribute to my students and discuss and employ each tool included on the CD as classroom lessons.
Slax is a Linux operating system based on Slackware. Slax was created and is under development by Tomas Matejicek of the Czech republic. There are many modules that include applications, which can be easily added to the operating system to make a powerful computer maintenance tool.