fizzit uses an ICE40UP5K FPGA to provide configurable baseboard wiring. Because the required design is relatively simple it is possible to do this visually with circuirverse e.g.

Circuitverse generates VDHL which is an input to chip (under development) which uses yosys to generate the ICE40 bitstream and loads this into the fizzit's FPGA flash via the fizzit debug USB interface.