Convert 3GPP program

I want to convert a 3GPP video file to avi or any sort.
What’s the best program to do that?
Answer #1
Xilisoft video convertor..
or
E.M total video convertor…
Answer #2
try DVDVideoSoft, it’s free…
Answer #3
freemake video convertor
http://www.freemake.com/free_video_converter/