System-wide audio equalizer for the Mac. Basic edition is free and open source. Improves your audio listening on OSX / macOS. Experience music on your Mac, how it’s meant to be.

System-wide audio equalizer for the Mac. Basic edition is free and open source. Improves your audio listening on OSX / macOS. Experience music on your Mac, how it’s meant to be.

A web based audio/video streaming (PHP) application and file manager allowing you to access your music & videos from anywhere, using almost any internet enabled device.
ampache.org
github.com/ampache
www.reddit.com/r/ampache
en.wikipedia.org/wiki/Ampache

Music Player Daemon (MPD) is a flexible, powerful, server-side application for playing music. Through plugins and libraries it can play a variety of sound files while being controlled by its network protocol.
MPD can broadcast via Snapcast.
Giada is a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians. How does it work? Just pick up your channel, fill it with samples or MIDI events and start the show by using this tiny piece of software as a loop machine, drum machine, sequencer, live sampler or yet as a plugin/effect host. Giada aims to be a compact and portable virtual device for Linux, Mac and Windows for production use and live sets.

Soundgrain is a graphical interface where users can draw and edit trajectories to control granular sound synthesis. Soundgrain is written with Python/WxPython and uses Pyo as its audio engine.

FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has reached widespread distribution. FluidSynth itself does not have a graphical user interface, but due to its powerful API several applications utilize it and it has even found its way onto embedded systems and is used in some mobile apps.
Features:
- Cross platform support (Linux, macOS and Windows to name a few)
- SoundFont 2 support
- SoundFont 3 support (vorbis-compressed SF2)
- Realtime effect control using SoundFont 2.01 modulators
- Playback of MIDI files
- Shared library which can be used in other programs
- Built in command line shell

QSynth is a fluidsynth GUI front-end application written in C++ around the Qt framework using Qt Designer.

FluidPatcher is a performance-oriented interface for FluidSynth built using wxpython to create a simple GUI that allows live editing, selecting, and playing of patches. A patch is a collection of settings such as soundfont presets for each MIDI channel, control-change/sysex messages to send when the patch is selected, and midi router or effects settings. Groups of patches are stored in banks, which are saved as human-readable and -editable YAML files. This allows a musician to easily create complex combinations of synthesizer settings ahead of time and switch between them on the fly during a performance.
The Facebook 360 Spatial Workstation is a software suite for designing spatial audio for 360 video and cinematic VR. It includes plugins for popular audio workstations, a time synchronized 360 video player and utilities to help design and publish spatial audio in a variety of formats. Audio produced with the tools can be experienced on Facebook News Feed on Android and iOS devices, Chrome for desktop and the Samsung Gear VR headset through headphones.
A Free and Open Source community driven media server, providing ubiquitous access to your music.
Soundboard makes building / executing sound cues for theatrical performance a snap. With a mix of sound, fade, stop, pause, and resume cues, you can create elegant designs, and execute them with the simple push of a button.
- Create elegant designs using a combination of simple cue types.
- Supports popular audio formats, such as wav, mp3, and Ogg
- Written in Java for true cross-platform compatibility
- Simple to use, so you’ll have a novice operator running the show perfectly in no time.
A stealthy, simple, unobtrusive open source multi-platform music player that stays out of your way in your Menubar / Taskbar.
WaveSurfer is an open source tool for sound visualization and manipulation. Typical applications are speech / sound analysis and sound annotation / transcription. WaveSurfer may be extended by plug-ins as well as embedded in other applications.
Features:
- Customizable – users can create their own configurations. Localization support.
- Extensible – new functionality can be added through a plugin architecture.
- Embeddable – WaveSurfer can be used as a widget in custom applications.
- Transcription file formats – reads, and writes HTK (and MLF), TIMIT, ESPS/Waves+, and Phondat. Support for encodings and Unicode.
- Multi-platform – Linux, OSX & Windows.

sourceforge.net/projects/wavesurfer
en.wikipedia.org/wiki/WaveSurfer
eSpeak is a compact open source Linux and Windows speech synthesizer for English and other languages. eSpeak uses a “formant synthesis” method. This allows many languages to be provided in a small size. The speech is clear, and can be used at high speeds, but is not as natural or smooth as larger synthesizers which are based on human speech recordings.
eSpeak is available as:
- A command line program (Linux and Windows) to speak text from a file or from stdin.
- A shared library version for use by other programs. (On Windows this is a DLL).
- A SAPI5 version for Windows, so it can be used with screen-readers and other programs that support the Windows SAPI5 interface.
- eSpeak has been ported to other platforms, including Android, Mac OSX and Solaris.