a free open source audio player for OS X
Features:

a free open source audio player for OS X
Features:

Sayonara is a small, clear and fast audio player for Linux written in C++, supported by the Qt framework. It uses GStreamer as audio backend. Sayonara is open source and uses the GPLv3 license. One of Sayonara’s goals is intuitive and easy usability. Currently, it is only available for Linux and BSD. Although Sayonara can be considered as a lightweight player, it has a lot of features in order to organize even big music collections. In contrast to the heavyweight players, the main focus of Sayonara is performance, low CPU usage and low memory consumption. Sayonara is a great alternative to players like Rhythmbox, Clementine or Amarok. Those who miss Winamp for Linux should give Sayonara a try.
Managing your library: You can manage your library by artists, albums, genres or file paths. Sayonara contains a sophisticated tag editor helping you to keep your collection clean. You can hold multiple playlists simultaneously, save/rename/delete or export them to common playlist file formats. With the multi library feature you can manage multiple directories as stand-alone libraries and copy and move tracks from one to another. There are even more complex library plugins like Soundcloud or SomaFM support.
Directory view: Some people don’t have a perfect tagged library and are more interested in the directory structure of their libraries. Sayonara provides various features to access and edit your music in the directory view.
Plugins: In addition, there are some useful plugins helping to enhance your comfort while listening. Some interesting plugins are the equalizer, a speed/pitch control, a crossfader, bookmarks for tracks and a broadcasting function.
Webstreams and Podcasts: You can record all tracks streamed from the internet. Your saved tracks automatically tagged, of course. When listening to ordinary webstreams, a history of all played tracks can be displayed. If webstreams or podcasts contain some chapter information, Sayonara also uses this information in order to provide fast jumping within these tracks.

SoundTracker is a music tracking tool for Unix / X11 similar in design to the DOS program FastTracker and the Amiga legend ProTracker. Samples can be lined up on tracks and patterns which are then arranged to a song. Supported module formats are XM and MOD; the player code is the one from OpenCP. A basic sample recorder and editor is also included. SoundTracker is free (“open source”) software, licensed under the GNU GPL.
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OPENCP is a music file player for DOS, Linux, Unix, Windows 95, ME & XP.
It’s derived from the Cubic Player 2.0 which was developed by Niklas Beisert.

Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling. Ecasound supports a wide range of audio inputs, outputs and effect algorithms. Effects and audio objects can be combined in various ways, and their parameters can be controlled by operator objects like oscillators and MIDI-CCs. A versatile console mode user-interface is included in the package.
The primary platform for running Ecasound is GNU/Linux. Ecasound can also be run on many UNIX-derived systems such as FreeBSD, Mac OS X and Solaris. Limited support for Windows is available through Cygwin.
Matchering 2.0 is a novel Containerized Web Application and Python Library for audio matching and mastering. It follows a simple idea – you take TWO audio files and feed them into Matchering:
- TARGET (the track you want to master, you want it to sound like the reference)
- REFERENCE (another track, like some kind of “wet” popular song, you want your target to sound like it)
Our algorithm matches both of these tracks and provides you the mastered TARGET track with the same RMS, FR, peak amplitude and stereo width as the REFERENCE track has.
exhale, which is an acronym for “Ecodis eXtended High-efficiency And Low-complexity Encoder”, is a lightweight library and application to encode uncompressed WAVE-format audio files into MPEG-4 format files complying with the ISO/IEC 23003-3 (MPEG-D) Unified Speech and Audio Coding (USAC, also known as Extended High-Efficiency AAC) standard. In addition, exhale writes program peak-level and loudness data into the generated MPEG-4 files according to the ISO/IEC 23003-4, Dynamic Range Control (DRC) specification for use by decoders providing DRC. exhale currently makes use of all frequency-domain (FD) coding tools in the scale factor based MDCT processing path, except for predictive joint stereo, which is still being integrated. Its objective is high quality mono, stereo, and multichannel coding at medium and high bit rates, so the lower-rate USAC coding tools (ACELP, TCX, Enhanced SBR and MPEG Surround with Unified Stereo coding) won’t be integrated.
gitlab.com/ecodis/exhale
hydrogenaud.io/index.php?topic=118888
flowEQ uses a disentangled variational autoencoder (β-VAE) in order to provide a new modality for modifying the timbre of recordings via a parametric equalizer. By traversing the learned latent space of the trained decoder network, the user can more quickly search through the configurations of a five band parametric equalizer. This methodology promotes using one’s ears to determine the proper EQ settings over looking at transfer functions or specific frequency controls. Two main modes of operation are provided (Traverse and Semantic), which allow users to sample from the latent space of the 12 trained models.
Applications:
- Quick and easy timbral adjustments
- Automated timbral shifts over time for creative effects
- Powerful ‘tone controls’ for users in a playback/listening setting

Ideal solution, if you need to preview your track in mp3 mode during playback.

github.com/Iunusov/LameVST
www.kvraudio.com/product/lamevst-by-r-tur
Flutterbird is a free, open-source effect plugin for adding pitch and volume fluctuation to incoming audio. It can be used for traditional wow/flutter effects as well as more chaotic, extreme modulation. Flutterbird has four separate oscillators with adjustable speeds that can be mapped to either pitch or volume.

tesselode.itch.io/flutterbird
github.com/tesselode/flutterbird