Ruhe Manöver Prototyp open source guitar effects Formel Dividende Wanne
OpenStomp, an open source guitar processor | TechCrunch
ElectroSmash - pedalSHIELD Arduino Guitar Pedal.
Electro-Smith - More than just an evaluation platform, Daisy Petal is the ultimate utility guitar pedal. From resonant filterbank to euphoric reverb, exciting new sounds are available via our open-source library. Link