A curated list of audio processing tools, libraries, and resources — organized by equalizer , visualization , lyrics/subtitle synchronization , and audio analysis .
Tools and libraries that provide frequency band control (graphic/parametric EQ), filtering, and gain adjustment.
Project
Language
What it does
License
Link
pedalboard (Spotify)Python + C++
VST3/AU plugin host with 40+ built-in effects including EQ, compressor, reverb.
BSD-3
GitHub
awesome-audio-equalizer Python
Processes audio stream from input device, applies filtering, streams to output device.
MIT
GitHub
Project
Language
What it does
License
Link
equalizer (0xba1a)JavaScript
Web Audio API-based EQ using AudioContext and cascaded BiquadFilterNode.
—
GitHub
equalizer.js JavaScript + Canvas
Audio analysis tool with FFT visualization. Visualizations synced to playback.
MIT
GitHub
Waviz React + TypeScript
Audio visualization library with waveforms and frequency bars. Published on npm.
MIT
GitHub
Project
Language
Plugin Formats
What it does
License
Link
ZLEqualizer C++ (JUCE)
VST3, AU, LV2
Dynamic EQ with customizable bands, spectrum display, equalization match feature.
GPL-3.0
GitHub
FreeEQ8 C++ (JUCE)
VST3, AU, LV2
8-band parametric EQ plugin for macOS, Linux, Windows. Linear phase, dynamic EQ, match EQ.
GPL-3.0
GitHub
equalize_it C++ (JUCE)
VST3
12-band parametric EQ.
GPL-3.0
GitHub
RBJ Audio EQ Cookbook C++
—
Implementation of Robert Bristow-Johnson's EQ filter coefficient formulas.
—
GitHub
Project
Platform
What it does
License
Link
eqMac macOS
System-wide audio equalizer with volume mixer. Swift-based.
GPL-3.0
GitHub
Equalizer APO Windows
Parametric/graphic equalizer. Uses Windows Audio Processing Object (APO) interface.
GPL-2.0
SourceForge
Tools that render audio data as visual output: waveforms, spectrograms, frequency bars, and audio-reactive graphics.
JavaScript Libraries (Browser)
Project
Language
What it does
License
Link
wavesurfer.js TypeScript
Interactive audio waveform rendering and playback. Plugins: Regions, Timeline, Envelope, Minimap, Record, Spectrogram, Hover.
BSD-3
GitHub
peaks.js (BBC)JavaScript
Audio waveform display with zoom/pan interaction.
MIT
GitHub
audioMotion-analyzer JavaScript
Real-time spectrum analyzer. CQT, FFT, octave bands. Multiple scales: linear, log, Mel, ERB, Bark.
ISC
GitHub
Clubber.js JavaScript
Music theory concepts applied to audio-reactive visualization.
MIT
GitHub
Pulse Visualizer C++
Audio visualizer inspired by MiniMeters. Cross-platform via CMake.
GPL-3
GitHub
Project
Platform
What it does
Link
react-voice-visualizer React Web
Web Audio API for audio recording and visualization. Waveform and amplitude bars.
GitHub
react-audio-visualizer-pro React Web
Multiple visualization types: waveform, frequency bars, circular. Customizable themes.
GitHub
r3f-audio-visualizer React + THREE.js
THREE.js 3D visualization synced to audio frequency data.
GitHub
audio-ui React
Component library for building audio software UIs. Faders, knobs, meters.
GitHub
react-audio-visualize (samhirtarif)React
Audio visualizer with separate components for live audio and audio blobs.
GitHub
Spectro React + WebGL
Real-time audio spectrogram generator.
GitHub
Desktop & Standalone Visualizers
Project
Language
Platform
What it does
License
Link
cava C
Linux, macOS, Windows (WSL)
Terminal frequency bars. Uses ALSA, PulseAudio, PipeWire, or PortAudio input. Color-coded.
MIT
GitHub
GLava C
Linux
OpenGL-based audio spectrum visualizer for desktop environments.
MIT
GitHub
MilkDrop 3 C++
Windows
Updated MilkDrop music visualizer with beat detection and double-preset loading.
—
GitHub
ModV JavaScript + GLSL
Desktop (Electron)
Modular, shader-based audio visualizer/VJ software. Vue-based.
GPL-3.0
GitHub
Euphonica Rust + GTK4
Linux (GNOME)
MPD client with spectrum visualizer. Built with Rust, GTK4, Libadwaita.
MIT
GitHub
XR3Player Java + JavaFX
Cross-platform
Media player with built-in spectrum analyzer and audio visualization.
—
GitHub
Project
Language
What it does
Link
Waveform (OBS) C++
Audio spectral analysis plugin for OBS Studio. Renders waveform overlay in OBS scenes.
GitHub
videojs-wavesurfer JavaScript
Video.js plugin that adds navigable audio/video waveforms and visualization.
GitHub
Project
Language
What it does
Link
ShowCQTBar —
Real-time CQT (Constant-Q Transform) bar visualization for audio files.
GitHub
Project
Language
Platform
What it does
Link
flutter_soloud Dart (Flutter) + C++ (FFI)
Mobile/Desktop
Flutter plugin for low-level audio processing and visualization using the SoLoud C++ library via FFI.
GitHub
Project
Language
What it does
License
Link
Waveform Playlist TypeScript
Multitrack Web Audio editor/player with canvas waveform preview, cue/fade editing, WAV/AudioBuffer export.
MIT
GitHub
Lyrics & Subtitle Synchronization
Tools for parsing, generating, aligning, and converting timed text (LRC, SRT, ASS) to match audio playback.
LRC (Lyrics) — Parsers & Libraries
Project
Language
What it does
License
Link
syncedlyrics Python
Fetches and parses synchronized lyrics in LRC format from online sources.
MIT
GitHub
openlrc Python
Transcribes audio with OpenAI Whisper, translates with LLM (GPT/Claude), outputs LRC files.
GPL-3.0
GitHub
lrcget Vue + Rust
Utility for mass-downloading LRC synced lyrics for offline music library.
MIT
GitHub
syrics Python
CLI tool to fetch lyrics from Spotify and save to lrc file.
GPL-3.0
GitHub
Lyrica Python
Tool to fetch lyrics (synced and non-synced) and print as JSON.
—
GitHub
lrxy Python
Synced lyrics downloader, converter and embedder tool.
GPL-3.0
GitHub
Lyricsync Python
Auto-sync via VAD + WhisperX + segment alignment. CLI and Web UI.
—
GitHub
lrc-kit (reteps)Python
Library for searching, downloading, and parsing song lyrics in LRC format.
—
GitHub
lrc-kit (weirongxu)TypeScript
Lyric parser, maker, and runner. JavaScript/TypeScript ecosystem.
MIT
GitHub
lrc-file-parser JavaScript
JavaScript-based LRC file parser.
—
GitHub
liricle TypeScript
JS/TS library to synchronize lyrics with audio playback position.
—
GitHub
lrctoolbox Python
CLI tool for .lrc files: edit, convert, analyze.
—
GitHub
Project
Language
What it does
Link
LySy Web (JS)
Web app for timestamp-based LRC lyric creation with download.
GitHub
EasyLRC Web
Web-based LRC lyric editing interface.
GitHub
LRC — Specifications & Extensions
Resource
Format
What it does
Link
LRCv2 (draft)LRC v2
Spec draft for synced lyrics with translation support, metadata fields, and chord annotations.
GitHub
lyrsync JavaScript + CSS
Uses CSS custom properties and timers to display synced lyrics with styling.
GitHub
Accompanist-Lyrics Kotlin
Parse, convert, export lyrics. Supports Apple Music format and LRC. For Android/JVM.
GitHub
Project
Language
Method
What it does
License
Link
ffsubsync Python + C
Audio fingerprinting
Automatic subtitle sync using audio fingerprint alignment. Supports SRT, ASS, VTT.
MIT
GitHub
autosubsync (oseiskar)Python
AI/ML shift + speed correction
Resynchronizes subtitles without human input. Detects time shift and playback speed drift.
MIT
GitHub
Audio Processing & Analysis
Core libraries for loading, decoding, analyzing, and transforming audio data.
Project
What it does
Language / Backend
License
Link
librosa Audio/music analysis. Feature extraction (MFCC, chroma, tempo), onset detection, beat tracking, STFT.
Python + NumPy, SciPy
ISC
GitHub
pydub Audio manipulation. Slice, concatenate, format conversion, volume adjustment, effects. Uses ffmpeg for decoding.
Python
MIT
GitHub
python-soundfile Audio file I/O. Read/write WAV, FLAC, OGG, and other formats via libsndfile.
Python + libsndfile
BSD-3
GitHub
pyAudioAnalysis Audio ML. Feature extraction, classification, segmentation, speaker diarization.
Python + scikit-learn
Apache-2.0
GitHub
torchaudio Deep learning audio. Audio I/O, transforms (Mel, MFCC, SpecAugment), datasets, pre-trained models (Wav2Vec2, HuBERT).
Python + PyTorch
BSD-2
GitHub
essentia MIR / audio analysis. 400+ algorithms: rhythm, tonality, timbre, loudness, speech/music detection.
C++ + Python
AGPL-3.0 / Commercial
GitHub
audioFlux Audio feature extraction. 60+ audio features (FFT, STFT, MFCC, chroma, wavelet). GPU-accelerated.
C + Python
MIT
GitHub
SoundCard Python audio I/O. Works with ALSA, CoreAudio, WASAPI.
Python + C
BSD-3
GitHub
aubio Audio labeling. Tempo, beat, pitch, onset, silence detection.
C
GPL-3.0
GitHub
Project
What it does
License
Link
meyda Audio feature extraction: MFCC, spectral centroid, zero-crossing rate, chroma, loudness. Web Audio API-based.
MIT
GitHub
web-audio-beat-detector Detects BPM and beat positions from audio via Web Audio API.
MIT
GitHub
waveform-data-generator (BBC)Resample, offset, and segment waveform peak data.
MIT
GitHub
Project
What it does
License
Link
libsndfile Audio file I/O. Read/write WAV, AIFF, FLAC, OGG, and more.
LGPL-2.1
GitHub
SoX Format conversion, effects, analysis. CLI tool.
GPL-2.0 / LGPL
SourceForge
Project
What it does
License
Link
hound WAV encoding and decoding.
MIT
GitHub
rodio Audio playback. WAV, OGG, FLAC, MP3 with effects.
Zlib
GitHub
Project
What it does
Link
audio Audio processing interface. Decoding, encoding, resampling, effects pipeline.
GitHub
Wrappers, utilities, and higher-level abstractions built on the browser's native Web Audio API.
Project
What it does
License
Link
standardized-audio-context Cross-browser AudioContext implementation following the Web Audio API spec.
MIT
GitHub
web-audio-analyser Thin wrapper around AnalyserNode for waveform and frequency data access.
—
GitHub
Pizzicato.js Oscillators, samples, effects (delay, reverb, distortion). Chainable API.
MIT
GitHub
p5.sound Extension to p5.js: amplitude, FFT, filters, oscillators, soundfile playback, spatial audio.
LGPL
GitHub
Tone.js Music composition. Synths, effects, transport control, scheduling.
MIT
GitHub
Frameworks and tools for building audio plugins (VST, AU, AAX) and digital signal processing.
Project
Language
Plugin Formats
What it does
License
Link
JUCE C++17
VST, VST3, AU, AUv3, AAX, LV2
Cross-platform framework. Includes Projucer IDE, CMake build, DSP module (IIR, FIR, convolution, FFT).
BSD/Commercial
GitHub
iPlug2 C++11
VST2, VST3, AU, AUv3, AAX, WAM
Alternative to JUCE. CMake build, iOS/Android support, web-based plugin support.
zlib
GitHub
DISTRHO C++
LV2, VST2, VST3
Plugin framework for Linux. Focus on LV2 ecosystem.
ISC
GitHub
NIH-Plug Rust
VST3, CLAP
Rust-based audio plugin framework.
MIT
GitHub
Web Audio Modules (WAM) JavaScript
Web Audio
Specification for running Web Audio API-based plugins in the browser.
—
GitHub
Contributions are welcome. Please see CONTRIBUTING.md for guidelines.
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This list is dedicated to the public domain under CC0 1.0 Universal .