BerryBoot
This bootloader allows you to install multiple Raspberry Pi operating systems on a single SD card, as well as to store OS files on a separate hard drive, rather than on an SD card, as is usually the case.
The site lists a number of operating systems for the Raspberry π.
Sun Mar 28 20:44:34 2021 - permalink -
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https://www.techrepublic.com/pictures/choosing-a-raspberry-pi-os-heres-the-definitive-list/33/