Clementine - Clementine is a cross-platform free and open source music player and library organizer based on...
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)
MusicBee - While iTunes might be the benchmark music organizer and player app, MusicBee is a strong alternative that many prefer.
CopyTrans - CopyTrans is a tool for managing the files on your iPhone or iPad through your computer's interface.
Droid Transfer - Save and Print your Android Phone Messages, Manage Photos, Music and other files on your Android Phone through your PC. Android Transfer Software.
iExplorer - iExplorer lets you easily transfer music, playlists, text messages, files and more from any iPhone, iPod, or iPad to a Mac or Windows computer and iTunes.