Easy2Boot is another good one. Creates USB boot disks with multiple OS ISOs on and boot into any of them. It’s no longer being updated, but still works, just used it this week.
The only caveat is you need to make sure each ISO is stored on the USB in a contiguous file, since it tricks the host machine into thinking each ISO is separate partition. It includes a .cmd script for doing this on Windows, or on Linux you can use `rsync —preallocate` to copy the ISOs continuously.
Why do you say it's no longer being updated? Looks like he last posted 3/30/21.
He's actually great, when he's online he has a chat option on his website and he'll help you with any questions you have, I somehow screwed up an E2B MBR and he very graciously walked me through fixing it.
Hmm, I could have sworn I saw a comment somewhere on the site that it’s no longer in development, but can’t find it now, maybe I just hallucinated it. Good to know it’s still going then!
https://www.easy2boot.com/
The only caveat is you need to make sure each ISO is stored on the USB in a contiguous file, since it tricks the host machine into thinking each ISO is separate partition. It includes a .cmd script for doing this on Windows, or on Linux you can use `rsync —preallocate` to copy the ISOs continuously.