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A list of open source VST/audio plugin projects. Please contribute more links or open source your own plugins.

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Open Source Audio Plugins & Apps

A list of open source VST (and other format) plugin/app projects. The intention of this list is to catalog open source plugins or apps which are fully featured or are useful examples which have non-trivial features.

The main benefit of having Open Source plugins/apps is that the code itself is preserved for the future, so when the author(s) stop updating it the community can continue using and developing the software. Open Source projects are also a great way to learn how different audio FX/instruments are created.

https://openaudio.webprofusion.com

Please contribute links!

Audio Plugins

Plugin Description Type Framework
ADLplug FM Chip Synthesizer — OPL & OPN Instrument JUCE
andes Sound synthesiser plugin based on Perlin noise Instrument JUCE
Airwindows Various small and experimental effect plugins Effect
amsynth Analog-modelling (virtual analog) synthesizer Instrument GTK
Argotlunar Real-time delay-line granulator Effect JUCE
Audio Effects Plugins implemented from the explanations in the book “Audio Effects: Theory, Implementation and Application” Effect JUCE
BinAural VST Mono-to-stereo plugin that positions sound in a 3D space using Head-Related Transfer Functions Effect JUCE
CHOW A maximally truculent distortion effect Effect JUCE
Cloud Seed Algorithmic reverb for emulating huge, endless spaces and modulated echoes Effect
Cocoa Delay Warm and lively delay Effect WDL-OL
Convolver Impulse-response reverb Effect VSTGUI, JUCE
Dexed DX7 FM plugin synth Instrument JUCE
Digits Phase-distortion synth inspired by Casio CZ series Instrument VSTGUI
Distrho glBars OpenGL bars visualization plugin (as seen in XMMS and XBMC/Kodi) adapted from jack_glbars Effect DPF
Distrho Juice Plugins Misc DPF
Distrho Kars Simple karplus-strong plucked string synth based on the karplong DSSI example synth Instrument DPF
Distrho Mini-Series Collection of small plugins based on LOSER-Dev Plugins Effect DPF
Distrho MVerb DPF-based version of MVerb Effect DPF
Distrho ndc Plugs DPF-based versions of some of ndc Plugs Effect DPF
Distrho Nekobi Simple single-oscillator synth based on Roland TB-303 Instrument DPF
Distrho ProM Music-visualizer plugin based on projectM Effect DPF
Dragonfly Reverb Hall-style reverb based on Freeverb3 algorithms Effect DPF
Element Advanced Audio Plugin Host Misc JUCE
Eurorack Diverse set of physical modeling sources, organic processors, wavetable oscillators, waveshapers, granular synths, and utility modules Misc
Flutterbird Simple pitch fluctuation Effect iPlug 2
Gverb/Gigaverb Reverb Effect VSTGUI
Helm Polyphonic synth with lots of modulation Instrument JUCE
hexter Yamaha DX7 modeling FM synth for DSSI Instrument DPF
Harsh Digital Nose Experimental synthesizer that converts two images into two oscillator waveforms and then mixes them in various horrible ways Instrument JUCE
HiLoFilter Simple hipass/lopass filter controlled with a single knob Effect JUCE
JuceOPLVSTi FM synth based on Yamaha OPL2/3 emulation from DOSBox Instrument JUCE
Juno 6 Roland Juno 6/60 Synthesizer Instrument
keithhearne/VSTPlugins A collection of VST plugins Effect JUCE
K-Meter Implementation of a K-System meter according to Bob Katz' specifications Effect JUCE
KickMaker Synth specifically to create kick-drum sounds Instrument VSTGUI
LameVST LameMP3 as an effect Effect
mda FX and virtual instruments for PC and Mac Misc (no GUI)
Mika Micro Simple subtractive synth Instrument WDL-OL
Mr. Alias 2 Non-bandlimited oscillators which can be transposed near to and beyond the Nyquist frequency. Nice to psychedelic tracks Instrument JUCE
MVerb Studio-quality reverb using the Dattorro’s figure-of-eight reverb structure Effect VSTGUI
NotNotchFilter Performance-oriented filter designed to replace the mid-EQ found in a standard 3-band DJ mixer Effect JUCE
ndc Plugs VST plugins for Windows and OSX Misc
OwlBass Additive bass synth Instrument JUCE
OB-Xd Based on the Oberheim OB-X Instrument JUCE
Oxe FM Synth Multitimbral 8-operator FM synth (VST 2.4; Windows, Linux, macOS) Instrument VSTGUI
PulseDelay Timed delay effect Effect (no GUI)
QtVST VST plugins with a Qt interface Effect Qt
Regrader Degenerative delay Effect VSTGUI
Roth-AIR Mixing tool for easily adding airy, crispy presence to audio Effect JUCE
ScorchCrafter Guitar FX Audio DSP FX and plugins, mostly for guitar (amp sim) and other FX Effect VSTGUI
ShoutVST VST for streaming sound into Icecast/Shoutcast directly from VST hosts Effect VSTGUI, FLUID
Sound Analyser Real-time audio analysis to allow anyone to quickly set up and experiment with different algorithms Effect JUCE
Surge Subtractive wavetable synth Instrument VSTGUI
Synister Subtractive synth Instrument JUCE
Syntage VST 2.4 .Net Study Synth Instrument
Temper Digital distortion targeting VST, VST3, and AU for OS X and Windows Effect Faust, JUCE
Tunefish VST virtual analog synthesizer Instrument JUCE
traKmeter Loudness meter for correctly setting up tracking and mixing levels Effect JUCE
VCV Rack Virtual modular synth Misc RtAudio
VSTSID SID synthesizer instrument Instrument
VST2413 FM synth based on emulator of YM2413 (OPLL) chip used in Sega Master System and FM-PAC MSX expansion Instrument (no GUI)
Wolf Shaper Waveshaper plugin with spline-based graph editor Effect DPF
YK Chorus Chorus audio effect plugin based on DSP code by TAL Effect DPF
zam-plugins LADSPA/LV2/VST/JACK audio plugins for high-quality processing Effect DPF

Collections

  • VCV library — a library of plugins compatible with VCV Plugin Manager
  • Linux Synths - a list of linux based synths, some of which are open source

Open Source Audio Apps

Software Source Description
Ardour Ardour/ardour DAW
ASIO2WASAPI levmin/ASIO2WASAPI Universal ASIO driver for Windows
Audacity audacity/audacity Audio editor
Element Kushview/Element Advanced Audio Plugin Host
FlexASIO dechamps/FlexASIO Universal ASIO driver for Windows
Giada monocasual/giada Loop machine
Guitarix SourceForge → guitarix GNU/Linux Virtual Amplifier
Helio Workstation helio-fm/helio-workstation Sequencer
HISE christophhart/HISE Cross-platform framework/application for building sample-based virtual instruments (VST, AU, AAX)
Hydrogen hydrogen-music/hydrogen Drum machine
NewMixer jatinchowdhury18/NewMixer Mixing Software
LMMS LMMS/lmms DAW
OpenMPT OpenMPT/openmpt Popular tracker (formerly ModPlug Tracker) for Windows with support for IT, XM, S3M, MOD modules, VST plugins and ASIO
OwlPlug DropSnorz/OwlPlug Audio plugin manager
orDrumbox SourceForge → ordrumbox Drum machine
Psycle SourceForge → psycle Modular music tracker
VCV Rack VCVRack/Rack Modular synth
Zrythm zrythm/zrythm DAW

Open Source Software Development Libraries

Library Source Description
Cabbage rorywalsh/cabbage Framework for developing audio plugins and standalone instruments with Csound
Csound csound/csound Programming language for sound and music synthesis
DPF DISTRHO/DPF C++ framework for creating cross-platform audio plugins
Faust grame-cncm/faust Functional programming language for real-time signal processing
FluidSynth FluidSynth/fluidsynth Real-time synth based on the SoundFont 2 specifications
iPlug 2 iPlug2/iPlug2 Simple-to-use C++ framework for developing cross-platform audio plugins/apps
JUCE WeAreROLI/JUCE Cross-platform C++ framework for developing desktop and mobile apps and audio plugins
jVSTwRapper SourceForge → jvstwrapper Wrapper to write audio plugins in Java (VST 2.4, AU, LADSPA; Windows, Linux, macOS)
libopenmpt OpenMPT/openmpt Cross-platform C/C++ module-playback library based on OpenMPT
PortAudio Assembla → portaudio Cross-platform audio I/O library
RtAudio thestk/rtaudio C++ classes for cross-platform real-time audio I/O
rust-vst rust-dsp/rust-vst VST 2.4 API implementation in the Rust language
Soundpipe PaulBatchelor/Soundpipe Lightweight music DSP library written in C; over 100 modules, many ported from Csound
VSTGUI steinbergmedia/vstgui User-interface toolkit mainly for audio plugins
WDL-OL olilarkin/wdl-ol Simple-to-use C++ framework for developing cross-platform audio plugins (superseded by iPlug 2)

Code Samples

  • KlangFalter — a convolution audio plugin (e.g. for usage as convolution reverb)
  • FFTConvolver — an audio convolution algorithm in C++ for real-time audio processing

Open Data Resources

  • OpenAIR — the Open Acoustic Impulse Response Library (Convolution Reverb Impulse Responses to recreate reverb character of space and equipment/recordings)

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A list of open source VST/audio plugin projects. Please contribute more links or open source your own plugins.

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