In mentioning these free websites, I have gone for the five which lets us download free mobile ringtones to the PC rather than send it through the data carrier (in most countries for downloading data, carrier charges apply).
14 million users sharing their stuff through a slick interface. The site is powered by the community of users who make and upload the ringtones. The ringtone collection, 300,000 strong can be downloaded to the PC or the phone without the free signup. The site also supports iPhone ringtones. An added plus is the online tools to make ringtones, themes, wallpapers, and screensavers.