Convert multimedia files between formats.
iFFmpeg is a free, easy-to-use front-end for the powerful--and also free--command line tool FFmpeg, which lets you easily convert media files between different formats. (Note that you must also download an FFmpeg binary to use iFFmpeg, but the developer's Web site has simple, drag-and-drop instructions for doing so.)
Prism Plus Edition Video Converter for Mac is a simple video conversion tool.
Play almost any media file.
WMA to MP3 converter.