TIDAL - Tidal is a streaming music service supported by some of the most influential artists working in the industry.
iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
Apple Music - Apple Music app combines your personal iTunes library with Apple's music subscription service. Music you have purchased from the iTunes store, or synced over from other sources, is available in the "Library" tab. Read more about Apple Music.
Documents by Readdle - A central hub for all your files.