FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge.

File Converter is a very simple tool which allows you to convert and compress one or several file(s) using the context menu in Windows Explorer.

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.

Format Factory is a multifunctional media converter and DVD ripper. Its features include:

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.

WinFF is a GUI frontend and batch parser for the command-line multimedia tool FFmpeg. WinFF works by making a batch file that runs in the command-line, designed to launch the command-line tool with given settings from a preset.

Wondershare UniConverter is a multimedia tool featuring a DVD and video converter, DVD burner, and video downloader. It supports multiple formats such as AVI, WMV, MP4, MKV, FLV, 3GP, and MPG, and can convert videos to 3D.

ffWorks (formerly iFFmpeg) is a graphical front-end for FFmpeg , a command-line tool used to convert multimedia files between formats. The command line instructions can be very hard to master/understand, so ffWorks does all the hard work for...

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 files like images, videos, documents, audio and more to other formats with this free and fast online 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.

Prism is the most stable and comprehensive multi format video converters available and is very easy to use. It can convert video files from avi, mpg, vob, wmv (Windows Media Video formats) and more into avi, asf or wmv files.