MOD Duo: Building an open source guitar stomp box | Opensource.com
GitHub - vincentgosselin1/FPGA_Guitar_pedal: Guitar pedal I made for my FPGA (altera) class at school.
Best Free and Open Source Linux Guitar Tools - LinuxLinks
OWL Pedal – Rebel Technology
🎸 Best Free Virtual Guitar Amp Simulators VST for PC and Mac
Program sound effects for your guitar with pedalSHIELD | Arduino Blog
Open source JUCE based guitar distortion plugin released - News and Announcements - JUCE
OJD Is An Open-Source OCD Overdrive Pedal Emulation By Schrammel
Bandit - Guitar Pedal by ZUTA
Guitarix - GNU/Linux Virtual Amplifier
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