The 'Pando58' is an open-source, 58-key column staggered ergonomic split keyboard.
The keyboard can be configured using the Vial application, which makes it easy to configure.
I doubt will allow me to share a link, but all information can be found by searching 'Pando58 firmware', which will lead you to the site that has all the information you will need in regards to this keyboard.
I built this keyboard using the following hardware:
Kailh 'Box White' Keyswitches (clicky)Gateron 'Dune' Low profile keycaps (seen in photos)Custom 3D printed Orange/White case2x Raspberry Pi Zero
It looks great, it feels great, and is much more portable than my all time favorite keyboard (ugly/orthopedic looking Kinesis). Connects via USB-C, which I will provide a cable, as well as the simple CAT-5 style cable that connects the left and right halves.