Video Converter for Mac can extract audio from Video to MP3, WAV, AAC, AC3, WMA and M4A for your iPod, iPod nano, iPod shuffle, Zune, PSP, iPhone, iRiver, Archos, Creative Zen, etc.

Video Converter for Mac OS X can convert video files such as MPG, MPEG, MP4, 3GP, 3G2, AVI, Mpeg TS/TP (for HD Video) and output video formats including MOV, FLV, MP4, AVI, and MPG. It can also extract and convert the audio track from your video files to WAV, OGG, 3GP, Mp3 and M4A.

Video Editor for Mac can edit avi, mp4, mov, mpg, mpeg, flv, mkv, tod, mod on Mac OS X.

Video Editor for Mac offers you a one-stop service to edit video, audio, photo, effect and special effects. You are also allow to crop movie and trim movie freely. Using Mac Video Editor you can easily export flv, wmv, mkv to mp4, m4v, mov, avi, 3gp which are supported by iMovie, then it will be an easier thing for imovie to import them and export later on for playback onto iTunes, QuickTime.

I like using Nidesoft video converter.It converts video and audio files between all popular format such as convert AVI to MP4, MP3 to WAV, WMV to MPEG, MOV to AAC, etc.