A more descriptive and precise thread title will help cater to the right audience and get you more responses.
To edit your thread title, just click on the
button on the bottom right of your original post and then click the "Go Advanced" button below your message.
Because many things can be converted.
And properly researched via MRoogle, as this question is asked almost daily.
But to be less of an ass:
Handbrake, VisualHub, MPEG Streamclip, .... found via ..... I don't know how they call it wen you enter words into a white field and click some button and get a list of pages to look at.