Ambrosia Software, Inc. -- utilities/itoner
www.ambrosiasw.com/utilities/iToner
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
iToner enables you to quickly transfer custom ringtones for your iPhone - without modifying, hacking or having to reset your iPhone. Simply drag and drop your MP3 or AAC audio files on iToner's window, click the Sync button, and you're done. Even better,