MakeOwnRingtone.com - Make your own ringtone! Follow the steps:
Cool Sounds - Sounds Collection: Animals, Humans, Tools, Ultrasounds, Ringtones and more...
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.
Format Factory - Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.
AVCWare Ringtone Maker - AVCWare Free Ringtone Maker makes it easy for you to create MP3/M4R/AMR/WAV ringtones from almost all audio and video files with fade-in & fade-out effect.
Switchr.net - Switchr is a free online audio converter site that lets you convert audio files on the fly.