UNetbootin is a simple tool with which you can easily create Live USB units for a large amount of Linux distributions, without having to create or use any CD.
The program shows a simple window in which we have to indicate the parameters like the Linux distribution that we want to use, where the disc image can be found, and the customisation elements, like a different kernel.
UNetbootin doesn't include any disc images, so we will have to download them first. To make this task easier, it provides a link and information for each one of the distributions that can be used to create a Live USB.
Likewise, on its official website it provides links for the most common distributions with which it works.
By means of the program we'll manage to create a Live USB not only of the best known Linux distributions, but also of less known, but not worse, distributions like Slax or Puppy.
Ideal to rummage and muck around with all kinds of Linux distributions, without having to install them on your PC.