Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs. Tasks can be automated using projects, job queue and powerful scripting capabilities.

DVD Rebuilder is a DVD backup tool for making high quality DVD backups. DVD Rebuilder only works with unprotected/unencrypted discs.

http://www.jdobbs.com/

http://www.dvdshrink.org

GSpot is a Windows-based freeware designed to identify codecs using in video files. In addition, the application also checks if the required DirectShow filters or Video for Windows codecs are installed and configured for proper playback.

The application now includes full support for Ogg and limited support for numerous other commercial container formats, including numerous versions of MPEG, QuickTime movie, and Windows Media Video.

http://www.headbands.com/gspot

HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded DVD to MPEG-4 converter, available for MacOS X, Linux and Windows.

http://handbrake.fr

iTunes is a digital media player application for playing and organizing digital music and video files. The program is also an interface to manage the contents on Apple's popular Ipod digital media players as well as the iPhone

iTunes is available as a free download for Mac OS X, Windows Vista and Windows XP from Apple's website.

http://www.apple.com/itunes

Jahshaka is a video and film compositing, editing and special fx system that uses OpenGL & OpenML hardware rendering to give operators real time interactivity. The system is cross platform, and also includes full CG, paint and image processing modules.

http://jahshaka.org

http://www.codecpackguide.com/klmcodec.htm

http://mediainfo.sourceforge.net

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.

MediaCoder intends to be the swiss army knife for media transcoding in all time and at this moment, it already has millions of users from 170+ countries all over the planet.

http://mediacoder.sourceforge.net

Miro is a free application for channels of internet video (also known as 'video podcasts and video rss). Miro is designed to be easy to use and to give you an elegant fullscreen viewing experience.

http://www.getmiro.com

The QuickTime family of digital media creation, delivery and playback software lets you deliver live or pre-recorded video and audio to an audience of any size. When combined with QuickTime Player and QuickTime Pro, these applications work together to provide the industry’s first end-to-end, cross-platform, standards-based digital media delivery system.

http://www.apple.com/quicktime

SMPlayer intends to be a complete front-end for MPlayer, from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and more.

http://smplayer.sourceforge.net

STOIK Video Converter 2 is the new release of popular freeware utility which has millions of satisfied users who enjoy power, speed, and simplicity of this versatile instrument - a rare combination in the world of modern video compression technologies.

Convert AVI, WMV, DV  files in all possible combinations. Pick up one or multiple source video files, select output audio and video settings using preinstalled or custom profiles, and convert to single or multiple output video files.

Now supports DivX + MP3 AVI, Windows Media 9, multiple file conversion, and file merging.

http://www.stoik.com/products/svc

If you need a simple, yet very efficient tool to convert (encode) or play any Multimedia file, without reading manuals or spending long hours training, then SUPER © is all you need. It is a Multimedia Encoder and a Multimedia Player, easy-to-use with 1 simple click.

http://www.erightsoft.com/SUPER.html

http://www.protectedsoft.com

VideoInspector is a tool designed to provide you with as much information as possible about your video files. With VideoInspector you'll know why your video files has no sound or refuses to play correctly.

VideoInspector will help you installing the required CoDecs (coder/decoder software) for an optimal performance. It can also inspect your system to find which codecs are available, and it can also process multiple video files and export its result in HTML or plain text files.

http://www.kcsoftwares.com

http://www.videospin.com

VirtualDub is a video capture/processing utility for 32-bit Windows platforms (95/98/ME/NT4/2000/XP), licensed under the GNU General Public License (GPL).

VirtualDub is mainly geared toward processing AVI files, although it can read (not write) MPEG-1 and also handle sets of BMP images.

http://www.virtualdub.org

When dealing with codecs, more does not equal better. Having the least amount on your system is the best configuration. This is exactly what these packages will do for you.

You will no longer be restricted to using a specific player.
Windows Media Player and Media Center will be able to play all your files.

http://shark007.net/

VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

http://www.videolan.org/vlc

XP Codec Pack is one of the most completed codec packs which helps you to play all major audio and video formats.

And... to enjoy your multimedia experience, instead of 3 or 4 different players you get one, simple integrated player that plays almost all audio and video files: Media Player Classic.

http://www.xpcodecpack.com