There are 2 repositories under guitar-effects topic.
Audio plugin model of a modern classic guitar overdrive Pedal
A collection of LTSpice simulation files for popular guitar effects. :guitar: :electron: :musical_note: :chart_with_upwards_trend: Pull requests welcome :smiley:
Example effects code and binaries for the Cleveland Music Co. Hothouse Digital Signal Processing Pedal Kit
Guitar multi effect running on STM32F746-DISCO board
Digital Signal Processing techniques applied in audio signals. Delay, chorus, flanger, tremolo, overdrive and distortion effects systems implemented using Python.
Develop your next audio plugin or application with Flutter and Rust - Support for AU, AUv3, VST, VST3, AAX, LV2
Random Patch Generator For Zoom G9.2tt / G7.1ut effects pedal
An audio effect inspired by additive synthesis. The pitch of the signal is tracked and filters are used to change the volume of each harmonic. Implemented in JUCE.
This is a TouchOSC template to control the Roland GP-8 vintage guitar effect processor via MIDI
2018: ATMega1284 Quad Opamp Effects Box: The Stomp Shield for Arduino from Open Music Labs use an Arduino Uno and four opamps as a guitar effects box. Similar to the other ATMega1284 repository that shows how to port the Electrsmash Uno Pedalshield, I have also ported the Open Music Labs Guitar Effects box to the ATMega1284P which has 8 times more RAM than the Uno (16kB versus 2kB).
A simple synthetic feedback plugin for electric guitar. Built in the JUCE C++ framework. FFT based pitch tracking used to synthesize a simple sine wave. This should then be fed through an amplifier of your choice.
Adding music effects to audio using ADSP-21489 development environment
Multiband Distortion Guitar Effector
A Preamp Inspired By Ueberschall
Arduino replacement for the digital innards of the original SansAmp PSA-1
Various Effects for the FXDSP DSP guitar effects pedal