CLI
https://pypi.org/project/deemix/

https://www.reddit.com/r/deemix/

Python server with web interface:
https://gitlab.com/RemixDev/deemix-webui
https://gitlab.com/RemixDev/deemix-gui/-/tree/main

Standalone GUI, Server or one-file Server for Linux/Win/Mac x86:
https://download.deemix.app/0:/

Note: all of the above require an arl = arl cookie after logging into (free) deezer account. i.e. F12 in Firefox, storage, cookies, arl, then copy the content. The cookie is valid for 3 months.
Entering the arl cookie in the web interface stores it per client. Storing it in ~/.config/deemix/.arl and using –serverwide-arl flag can use the same for all clients.

Linux install/update of server with static libraries:

update-deemix.sh

#!/bin/bash
echo "Downloading latest version..."
wget https://download.deemix.app/server/linux-x64-latest
if [ -f "linux-x64-latest" ];
then
    echo "Backing up old version..."
    sudo rm -rf /opt/deemix-server-old
    sudo mv /opt/deemix-server /opt/deemix-server-old
    sudo mkdir /opt/deemix-server
    sudo mv linux-x64-latest /opt/deemix-server/deemix-server
    sudo chmod 755 /opt/deemix-server/deemix-server
    echo "Restarting deemix server..."
    systemctl --user restart deemix
    echo "Done!"
else
    echo "Download failed, not updating!"
fi

Linux user systemd service for server if extracted to /opt/deemix-server/:

mkdir -p .config/systemd/user/
vi .config/systemd/user/deemix.service 

[Unit]
Description=Deemix Server

[Service]
ExecStart=/opt/deemix-server/deemix-server --host 0.0.0.0 --serverwide-arl
Restart=always
RestartSec=10

[Install]
WantedBy=default.target

systemctl --user enable deemix

Console application Linux/Mac/Windows:
https://notabug.org/sayem314/d-fi
https://github.com/d-fi/releases/releases

Dependency may be required:

apt-get install lib64stdc++6

Download/update bash script:

dfiupdate.sh

#!/bin/bash

get_latest_release() {
  curl --silent "https://api.github.com/repos/$1/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/'
}
ver=$(get_latest_release "d-fi/releases")

cd /tmp
wget https://github.com/d-fi/releases/releases/download/$ver/d-fi-linux.zip
unzip d-fi-linux.zip
rm d-fi-linux.zip
mv d-fi ~/Downloads

Works with Deezer Album,Songs and Artists, not Podcasts.

Automatically monitor and/or download new releases of artists.

https://github.com/digitalec/deemon

Youtube Download (lots of supported sites: https://yt-dl.org/supportedsites.html )
https://yt-dl.org/
https://github.com/ytdl-org/youtube-dl

Works with youtube, soundcloud and many more

Install/upgrade not via apt or wget/curl but using:

sudo -H pip install --upgrade youtube-dl

Fixes to individual extractors not in official release yet can be applied as in the following example:

wget https://raw.githubusercontent.com/ytdl-org/youtube-dl/d42b7b6c5e927a8e4e82be96a551b5054e445974/youtube_dl/extractor/redtube.py
sudo mv /usr/local/lib/python3.8/dist-packages/youtube_dl/extractor/redtube.py /usr/local/lib/python3.8/dist-packages/youtube_dl/extractor/redtube.py_backup
sudo mv redtube.py /usr/local/lib/python3.8/dist-packages/youtube_dl/extractor/redtube.py

Workaround/Tip: per-site configuration files
https://github.com/ytdl-org/youtube-dl/issues/29523

Version 2021.12.17 requires the following youtube patch as of February 2023:
https://github.com/ytdl-org/youtube-dl/issues/31530#issuecomment-1433470254
In /usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py change:

'uploader_id': self._search_regex(r'/(?:channel|user)/([^/?&#]+)', owner_profile_url, 'uploader id') if owner_profile_url else None,

to:

'uploader_id': self._search_regex(r'/(?:channel/|user/|@)([^/?&#]+)', owner_profile_url, 'uploader id', default=None),

Mediasave Browser addon (Chrome)
https://mediasave.ru/en/
https://chrome.google.com/webstore/detail/mediasave-download-music/hfgbpkkdodfihabamnkhoaeamkdhnoec

Works with unprotected media

Media Download Helper (Firefox)
https://addons.mozilla.org/en-US/firefox/addon/media-download-helper/

Uses external service to record the stream. No Filenames/ID3tags preserved!

https://github.com/instaloader/instaloader

https://jdownloader.org/download/index

sudo apt-get install simplescreenrecorder

Stable PPA (Contains only official releases)

sudo add-apt-repository ppa:openshot.developers/ppa
sudo apt update
sudo apt install openshot-qt python3-openshot 

sudo apt-get install openshot