Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
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)
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
i-FunBox - General file management software for iPhone and other Apple products
JACK Audio Connection Kit - JACK Audio Connection Kit|Home
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.