The ArcBoard is a futuristic split keyboard with keywell and various integrated gadgets. Designer Chris Trotter aka crazymittens-r published a pedal extension: the mighty ArcPedals.
As promised, mk2 of the pedals, for your entertainment – crazymittens.
Keyboard specs
Split, 4x6 keywells with 5-key thumb clusters; 6x6 effective key matrix to program
Dual 34mm thumb trackballs
Dual 5-way dpads
Quad encoders w. LED backlighting
Connectivity via TRRS
Diffused LED indicator panel
TFT screens on both halves for doing fun things with quantum painter
Dovetail-attached large sloped palm rests
Modular design with M3 hot-melt inserts and M3x8 countersunk machine screws
Pedal specs
four actually-usable buttons per foot
trackball layer switcher
rgb rgb rgb
This trackball-like thing with the big led ring around it changes foot pedal layers: Swipe left/right/up/down to select 1 of 4 layers.