Any Video Converter (free version) is the most renowned free video converter for converting video files between various formats, with fast converting speed and excellent video quality.
Input formats:

avi, asf, mov, rm, rmvb, flv, mkv, mpg, 3gp, m4v, vob, YouTube videos and more

Output formats:

avi, mp4, wmv, flv, MPEG-1 and MPEG-2, mpg (PAL or NTSC), mp3, wma, ogg, aac

VLC is a portable multimedia player, encoder, and streamer released under the GNU and has support for a wide variety of audio and video codecs and file formats as well as DVDs, VCDs, and other streaming protocols. It includes a large number of common encoding and decoding codecs like 3GP, AVI, FLV, QuickTime, MP4, Ogg, etc.
A great advantage is that VLC plays incomplete videos, opens broken videos from BitTorrent and plays ISOs without unpacking the file it is also well known for being able to play encrypted DVDs on …