FOC-Stim is a family of next-generation estim devices that generate current-controlled analogue waveforms. It can be controlled with Restim.
Version 1 has 3 outputs. It uses a three-phase motor drive development kit from ST (the B-G431B-ESC1) for control. It only support three-phase output.
It is fairly easy to build with basic soldering skills, all parts can be ordered from mouser. For more information see docs/focstim-v1.md
Version 3 uses a custom PCB. It improves the original by adding one extra output, a battery, and wireless comms.
Currently in development.