Back ages ago, I had one of the CD-ROMs with full audio controls and analog out, and used it along with a bare AT PSU and one of those drive-bay equalizers as a desktop CD player, no proper computer involved anywhere.
In the same vain, as a child of about 10 I used to use a CD-ROM drive hooked up to a PSU and headphones to listen to music in bed. It was lovely as a portable CD player would have been totally unaffordable to my family at the time.