Fedora KDE Live CD 21 / 22 Beta

https://getfedora.org/
Fedora KDE Live CD is an open source and free distribution of Linux, a special Live edition of the well known Fedora operating system, built around the KDE SC desktop environment. It is designed from the ground up to be used for previewing and installing the Fedora OS on high-end machines.
Availability, boot options, supported platforms

The distribution is available for download as two Live DVD ISO images, one for each of the supported hardware platforms (64-bit and 32-bit), which allow users to test the operating system without installing anything on their computers.

There are only two options on the boot prompt. While the first one will start the live environment with default options, the second one give users access to more advanced options, such as the ability to run a memory diagnostic test, boot an operating system that is installed on the first disk, or start the live session in safe graphics mode (only if your graphics card is not recognized by the default entry).