Stoicheia

Stoicheia is a dual gate sequencer published under the GNU GPL v2 as Open Source and Open-source hardware.

Hardware
It uses an Atmel AVR microcontroller and is programmed the same as an Arduino Diecimila. It's has an USB interface, two clock inputs, and two 8 step sequence outputs which can be chained to give a single output.

Operation
It sequences a Euclidean Rythm as described by Godfried T. Toussaint in his 2005 paper "The Euclidean Algorithm Generates Traditional Musical Rhythms"