MakeOwnRingtone.com - Make your own ringtone! Follow the steps:
Audiko - Audiko Ringtones is a free to use mobile application that can help you customize your mobile phone by setting the most beautiful images your background and the most popular ringtones as your notification signals.
Song Cutter and Ringtone Maker - Free Online Ringtone Maker
Ringdroid - Create your own ringtone by editing a music track in your library, or record a new one directly...
Leawo iPhone Ringtone Maker - Professional iPhone ringtone maker for Mac, Leawo iAm Ringer helps you make iPhone ringtone, create iPhone ringtone from various video and audio formats easily and fastly.
Switchr.net - Switchr is a free online audio converter site that lets you convert audio files on the fly.