FFCoder!

HandBrake is an open-source, multithreaded video transcoder- it converts digital media from one format to another, compressing the files in the process. Handbrake can rip encrypted DVDs with libdvdcss (libdvdcss is installed with VLC media player on Mac OS X, or AnyDVD/DVD 43 on Windows).

Freemake Video Converter is video converter that lets convert videos to avi, wmv, mp4 (iPhone, iPod, iPad, PSP, xBox), 3gp, rip dvd, extract mp3, burn DVD and Bluray, create photo slideshow and audio visualization, cut, join, rotate and upload videos, photos and music to YouTube.

fre:ac (formerly BonkEnc) is a free audio converter and CD ripper with support for various popular formats and encoders. It currently converts between MP3, MP4/M4A, WMA, Vorbis, FLAC, AAC, WAV and Bonk formats.

Format Factory is a multifunctional media converter and DVD ripper. It will convert (and compress):

VidCoder is a DVD/Blu-ray ripping and video transcoding application for Windows. It uses HandBrake as its encoding engine.

XMedia Recode can convert nearly all popular audio and video formats including 3GP, 3GPP, 3GPP2, AAC, AC3, AMR, ASF, AVI, AVISynth, DVD, FLAC, FLV, H.261, H.263, H.264, M4A , M1V, M2V, M4V, Matroska (MKV), MMF, MPEG-1, MPEG-2, MPEG-4, TS, TRP, MP2, MP3, MP4, MP4V, MOV, OGG, PSP, (S) VCD, SWF , VOB, WAV, WMA and WMV.

MediaCoder is a free universal batch media transcoder, which nicely integrates most popular audio/video codecs and tools into an all-in-one solution. With a flexible and extendable architecture, new codecs and tools are added in constantly as well as supports for new devices.

Convert audio free to MP3, WMA, WAV, FLAC, AAC, M4A, OGG, convert audio to MP3 player, iPod, iPhone, iPad, PSP, extract audio from video, join audio files. Send MP3 and AAC files directly to iTunes from our audio converter.

MeGUI is a video conversion application, which was primarily designed to be a DVD ripper, but is capable of many transcoding tasks. It is essentially a frontend for many free tools, but also includes a number of utilities to enhance the conversion process.

AnvSoft Any Video Converter is the most renowned video converter for converting video files between various formats, with fast converting speed and excellent video quality.It can clip any segments and optionally merge and sort them to make a creative movie. And even more, Any Video Converter can crop frame size to remove any unwanted area in the frame just like a pair of smart scissors. Additionally, it gives you the ability to burn videos to DVD-R/RW, DVD+R/RW disc. It also adds the MP4 Faststart option to play back mp4 video in the stream way. »

Multiformat video encoding application.

MPEG Streamclip is a powerful free video converter, player, editor for Mac and Windows. It can play many movie files, not only MPEGs; it can convert MPEG files between muxed/demuxed formats for authoring; it can encode movies to many formats, including iPod; it can cut, trim and join movies. MPEG Streamclip can also download videos from YouTube and Google by entering the page URL.