Voicemeeter Banana is an Advanced Audio Mixer Application endowed with Virtual Audio Device used as Virtual I/O to mix and manage any audio sources from or to any audio devices or applications.

A graphical (Qt5) client for MPD, supporting the following features:

A new cross-platform Apple Music experience based on Electron and Vue.js written from scratch with performance in mind. A new look into listening and enjoying Apple Music in style and performance. 🚀 (Work in progress, expect bugs.) an Apple Music subscription is required to use this application. This may change in the future when we add local file support.
github.com/ciderapp/Cider
This is a React Native-based audio streaming app for Jellyfin. Jellyfin is a community-based piece of software that allows you to stream your media library over the internet. By means of React Native, Jellyfin Audio Player allows you to stream your Jellyfin Music library, with full support for background audio and casting (ie. Airplay and Chromecast).
github.com/leinelissen/jellyfin-audio-player
BitterSweet v3 is Flux:: acclaimed transient processor used by hundreds of thousands of users for audio transient management with the simple turn of a knob – Turning it to the Sweet side reduces the transients, and turning it to the Bitter side magnifies the transients – No dongle or license activation required – 100% Freeware!

Free VST audio effect plug-in download for music production, broadcasting and general audio editing.

With these tools one can get information about (via mkvinfo) Matroska files, extract tracks/data from (via mkvextract) Matroska files and create (via mkvmerge) Matroska files from other media files. Matroska is a new multimedia file format aiming to become THE new container format for the future. You can find more information about it and its underlying technology, the Extensible Binary Meta Language (EBML), at www.matroska.org
eac3to is able to convert E-AC3, TrueHD, PCM and DTS-HD audio tracks to AC3, DTS or FLAC. Converts E-AC3, TrueHD, PCM, DTS-HD and FLAC tracks to AC3 / DTS / FLAC. Removes Dialog Normalization from AC3, E-AC3, DTS and TrueHD tracks. Extracts AC3 frames from Blu-Ray AC3/TrueHD tracks. Extracts DTS core from DTS-HD tracks. Can remux the video track of a EVO / VOB source to Matroska (mkv). Command line tool but GUI (UsEac3to) also available. Requires external audio decoders.
forum.doom9.org/showthread.php?t=125966
en.m.wikibooks.org/wiki/Eac3to
en.m.wikibooks.org/wiki/Eac3to/How_to_Use
dkaac reads linear PCM audio in either WAV, raw PCM, or CAF format, and encodes it into either M4A / AAC file. If the input file is "-", data is read from stdin. Likewise, if the output file is "-", data is written to stdout if one of streamable AAC transport formats are selected by **-f**. When CAF input and M4A output is used, tags in CAF file are copied into the resulting M4A. github.com/nu774/fdkaac github.com/mstorsjo/fdk-aac launchpad.net/ubuntu/bionic/+package/fdkaac packages.debian.org/stretch/fdkaac
RaspyFi is an open source linux distribution. It will transform your Raspberry Pi into an audiophile source, in 10 minutes without hassles. It comes ready to play, and it’s compatible with almost every USB DAC available. You can consider it as a Voyage-MPD version for Raspberry Pi. But it’s simpler to use and it has several other functionalities!
With RaspyFi you’ll be able to play your music library directly from an USB Storage or from your NAS. You can also listen to your favourite web-radios and scrobble your favourite tunes from Spotify, Last.fm and Soundcloud. You will be amazed about the sound quality! RaspyFi’s core feature is this. We are trying to get every bit of your music to play as accurate as can be, optimizing every aspect of the system.
RaspyFi supports asynchronous playback to take advantage of the latest DACS, it features a nice webgui you can use to configure it without hassles and to play your library from your pc, your smartphone or your tablet.
You can connect your little Raspberry Pi to your Audio System, sit on your couch, use your favourite device (Win,Mac,Android,iOS) as a remote control and enjoy your music as it is. With RaspyFi your Pi never sounded so good!
Updated to: Volumio ~ Headless Audiophile Player