handbrake
HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.Supported Sources:Most common multimedia files that libavformat and libavcodec support.Any DVD or Bluray-like source which is NOT copy-protected. (removal of copy protection is not supported)

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AVC
Free Video Converter with millions of happy users!

Convert all videos to MP4, MP3, etc. for various media players

Create HTML5 videos with embedding code ready to use for websites Download and convert YouTube videos for offline viewing Burn videos into DVD movie playable on TV and DVD player Boost video conversion speed up to 6X faster with CUDA acceleration

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avi2dvd
2vi2Dvd is an All In One tool in order to convert with just few clicks an Avi/Ogm/Mkv/Mp4/Wmv/Dvd to Dvd/Svcd/Vcd.

Supports multiple audiostreams and up to three textual external subtitles. From the version 0.6 Avi2Dvd supports natively Windows Vista and Windows 7

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Media Corder
MediaCoder is a free universal media transcoder since 2005. It integrates most popular audio/video codecs and tools in an elegant and transparent manner into an all-in-one transcoding solution. With a flexible and extendable architecture, latest codecs and tools are updated added in constantly. MediaCoder intends to be the swiss army knife for media transcoding in all time.

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VLC
VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVD, Audio CD, VCD, and various streaming protocols.
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