There was also tomsrtbt[1], which was a staple in my "rescue" floppy collection. Along with the QNX floppy[2], which came in super handy when using a cyber café or a friend's PC, and you wanted to avoid all the keyloggers and malware.

[1] https://en.wikipedia.org/wiki/Tomsrtbt

[2] http://toastytech.com/guis/qnxdemo.html

Trinux was another such utility. It spanned multiple floppies, but booted to RAM and could effectively run from one. The additional disks were for additional tools/utilities.

Still apparently available on Sourceforge.net, though last updated in 2013:

<https://sourceforge.net/projects/trinux/>