The egg58 by Travis Mick aka le1ca/tmick0 is a column-staggered, low-profile split with 58 keys and per-key RGB. The PCB is reversible and open source.
Finally confident enough in my design to share it. […] I realize there are similar keebs out there, but I'm picky so I had to make my own – le1ca.
Specs
58 keys
low-profile, hotswap
Choc spacing
reversible PCB
Pro Micro footprint
per-key RGB
egg58 v2
The egg58 was designed to remain fairly close in layout to an ANSI 60% keyboard, but with a reduced number of keys and minimal thumb clusters.
I pretty much started with an ergodox layout, removed keys to make it roughly 60%, then tuned the stagger and thumb cluster positioning based on where my fingers would land on a printout – le1ca.