The Sweep by David Philip Barr is a version of the Ferris by Pierre Chevalier that uses a daughterboard like a Pro Micro, nice!nano etc. instead of using onboard components.
Variants
This family of splits consists of seven models at the time of writing this, with the Sweep 2 as the recommended variant.
Sweep 2 – Recommended Choc v1 board with all the features.
Sweep Half Swept – Same as Sweep 2, but with a reversible Pro Micro footprint.
Sweep Bling MX – An MX only Sweep that features Kailh's hotswap sockets and a stacked case.
Sweep Bling LP – A Choc v1 only Sweep that features Kailh's hotswap sockets.
Sweep High – Same as the Sweep 2, but trades choc spacing for compatibility with more switches and keycaps.
Sweep High M – A soldered MX only Sweep, with a reversible PCB design.
Sweep Mini – The only version that supports Choc minis.
Features
As you can see, features and specs vary: Choc or MX spacing, Choc or MX footprint, soldered or hotswap, reversible or not, etc.