A categorized collection of awesome music libraries, tools, frameworks and software.
Contributions and suggestions are always welcome! Please take a look at the contribution guidelines and quality standard first.
Thanks to all contributors, you're awesome and wouldn't be possible without you!
- Audacity - a free, cross-platform digital audio editor.
- audio.js - audio.js is a drop-in javascript library that allows HTML5's <audio> tag to be used anywhere.
- howler.js - a Javascript audio library for the modern web.
- JSyn - an audio synthesis software API for Java.
- Librosa - a python package for music and audio analysis, providing the building blocks necessary to create music information retrieval systems.
- midi.js - a framework for creating web-based MIDI apps.
- PortAudio - a free, cross-platform, open-source, audio I/O library.
- RustAudio - an aggregate of free and useful Audio, DSP and music libraries written in Rust.
- Soundpipe - a lightweight DSP library written in C.
- Beets - a powerful command-line music organizer and manipulator.
- Koel - an open-source personal audio streaming server.
- Lame - a high quality, free and open-source MP3 encoder.
- lltag - automatic command-line mp3/ogg/flac file tagger and renamer.
- Musikernel - a futuristic audio production platform (hardware support, APIs, hosts, plugins and more)
- SoX - a free open-source command line utility for playing, converting and manipulating audio files.
- cellist/Lilypond-Sheet-Music - a collection of music typeset with lilypond (mostly chamber music and music for cello).
- ciconia/music - a collection of mostly baroque music, lots of sacred works by J. S. Bach, coded in lilypond/ripple.
- CPDL - the choral public domain library contains more than 20K free scores of vocal music.
- Éditions Nicolas Sceaux - baroque music scores (mainly French music), typeset using lilypond.
- IMSLP - the International Music Score Library Project is the largest collection of public domain scores and parts on the web.
- Mutopia - sheet music based on editions in the public domain.
- wbsoft/lilymusic - beautiful LilyPond scores under free licenses.
- Timidity - an open-source command line synthesizer that plays MIDI files.
- Abjad - a Python API for Formalized Score Control, based on Lilypond.
- Denemo - a free music notation editor based on Lilypond.
- Frescobaldi - a free Lilypond sheet music editor.
- Guido - a generic, portable library and API for the graphical rendering of musical scores.
- Inknote - free, open source, browser based music notation and composition software.
- LibMEI - a C++ library for reading and writing MEI files.
- Lilybin - an open sourcle web-based lilypond editor.
- Lilypond - free, open-source music engraving program, devoted to producing the highest-quality sheet music possible.
- Lilypond Snippet Repository - an online database of Lilypond snippets ideas, features and hacks.
- Lilyvm - Lilypond version manager.
- Lydown - a modern language for music notation, based on Lilypond.
- Lyp - the lilypond package manager - install packages and manage multiple versions of lilypond.
- MuseScore - free open-source music notation and composition software.
- OpenLilyLib - LilyPond tools - snippets, templates, and extensions.
- Python-ly - a tool and library for manipulating LilyPond files.
- Ripple - DRY for Lilypond - generate scores and parts with minimal fuss.
- Tunefl - LilyPond mini-score engraving and sharing service for musicians.
- Verovio - a library and a toolkit for engraving MEI music notation into SVG.
- Vexflow - a JavaScript library for rendering music notation and guitar tablature.
- Alda - a music programming language for musicians.
- Chuck - strongly-timed, concurrent, and on-the-fly music programming language.
- CoffeeCollider - a language for real time audio synthesis and algorithmic composition in HTML5. "Write CoffeeScript, and be processed as SuperCollider."
- Common Music - an open source music composition system.
- Csound - a user-programmable and user-extensible sound processing language and software synthesizer.
- Faust - a functional programming language specifically designed for real-time signal processing and synthesis.
- IanniX - a graphical open-source sequencer, based on Iannis Xenakis works, for digital art.
- Inscore - an environmnent for the design of interactive, augmented music scores.
- Leipzig - a composition library for Overtone.
- Music Suite - a language for generalized music notation and theory, based on Haskell.
- Nyquist - a sound synthesis and composition language.
- Overtone - an Open Source toolkit for designing synthesizers and collaborating with music.
- Platonic Music Engine - an open-source music generation framework written in Lua.
- Sporth - a small stack based audio language.
- SuperCollider - a programming language for real time audio synthesis and algorithmic composition.
- OpenMusicTheory - a growing, online "textbook" for music theory and aural skills.
- MEI (Music Encoding Initiative) - an open-source effort to define a system for encoding musical documents in a machine-readable structure.
- MusicXML - the standard open format for exchanging digital sheet music.
- SMuFL (Standard Music Font Layout) - a specification for mapping music symbols to Unicode for use in music fonts.
Other amazingly awesome lists can be found in the 
To the extent possible under law, Sharon Rosner has waived all copyright and related or neighboring rights to this work.