other Pi distros (standing on the sholders of)

[mocore]

with comments in "(Is?)Tinycore based on *" @ https://forum.tinycorelinux.net/index.php/topic,1212.msg6945.html#msg6945

what other distro's are tc'ers booting (on a spare sd card ...ect )

what do they do differently?
... (how/if) can this be used to the benefit of (pi)core ?
 
eg
" FreeBSD bootable image for Raspberry Pi" has grub2 (via uboot) https://forum.tinycorelinux.net/index.php/topic,17627.msg105811.html#msg105811
(also fwiw suse)