Available as an assembled Module and as a DIY project.
This Module is currently available.
4 Channel Quantiser with note selection, V/Oct, Gate and parallel MIDI output
A feature packed quantiser module for Eurorack, tracking over 4 octaves.
This module makes a versatile addition to a Eurorack system. As well as basic quantisation, the note select switches allow it to be configured to output notes in any key. The Gate In jack can be used to turn the module into a quantised sample-and-hold, or to synchronise note changes precisely with an external clock. All 4 channels work independently, except they are all controlled by the note select switches running down the left side of the module. This makes it simple to play a 4 channel melody where all the notes are in the same key, for instance.
https://www.tindie.com/products/nbirch/quantiser-kit-eurorack-module-14hp/