Lidarr - Lidarr is a music collection manager for downloading and organizing music libraries.
Lark Player - Lark Player – YouTube Music & Free MP3 Top Player is a fine tool developed by Mobiuspace Tech Top Player.
Headphones - Automatic music downloader for SABnzbd. Headphones is an automated music downloader for NZB and Torrent, written in Python. It supports SABnzbd, NZBget, Transmission, µTorrent, Deluge and Blackhole.
Audiomack - The free SoundCloud alternative
Lacey - Free Music & Video Downloader
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.