8 step sequencer module with reverse, random, and offset — Sagittronics
This is a sequencer that Charlie Slick built with an Atmega arduino chip.
The chip basically replaces the CD4017-or the like-but adds a few features like gate controlled reverse and random. The modules also has an offset input so you can use it like an arpeggio. There is no gate output but it does have an externally trigger reset.