There is a multitude of free softwares to convert your videos on your Mac. Whether you need to convert videos for your portable devices (iPad, iPhone, iPod, PSP...) or rip your DVDs, here's a small list of the free softwares available for Mac.
Miro for Mac
Miro is an open source software that can handle most of the audio and video formats, including those used for mobile devices. Miro can read most multimedia files (Windows Media, QuickTime, Flash Video) and also includes a handy option to watch HD movies in full screen mode. The conversion feature of Miro allows you to encode most of the video formats. These formats can be read from several types of portable devices such as smartphones and tablets.
MacX Free DVD to AVI Converter is a program that is specifically designed to convert your DVDs to AVI format. You can also convert your DVD to MP4 if you wish. The graphical interface is very intuitive making the software really easy to use.
Any Video Converter for Mac is a tool that will allow you to convert videos to the desired format. Any Video Converter for Mac is simple and intuitive, which will facilitate you the grip. The software to support a large number of video formats like MP4, MPEG, 3GP and many others.