Zamzar - Free conversion online of many type of documents (images, text, video, audio...
XRECODE - XRECODE can convert multiple audio files in parallel by taking full advantage of multi-core CPU.
Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
Freemake Audio Converter - Audio Converter is a free to download file converter tool software developed by Freemake. Freemake has developed many free tools in the past, such as the popular Freemake Video Converter. Read more about Freemake Audio Converter.
Convertio - File Conversion in the Cloud
Convertio Online Audio Converter - Convertio Online Audio Converter allows everyone to convert audio files in any format directly from their web browser.