The famous full pack, not only for playing matroska media files, but it will also allow playback of most modern video formats on any DirectShow player, even with Windows Mediaplayer 6.4/7/8/9/10. For this reason the Matroska Pack Full has gathered some attention from the video compression scene, and has established itself as a very slim and intelligent alternative to the usually overloaded codec packs out there.
XviD is an ISO MPEG-4 compliant video codec. It's not a product, but an open source project which is developed and maintained by lots of people from all over the world.
The latest driver for Realtek ALC AC97 audio chipsets. The driver supports all ALC series audio chipsets from ALC100 up to ALC850 mainly used as onboard sound on various motherboards.
AutoGK (Auto Gordian Knot) is a DivX / XviD backup utility. With support of DVD sources and other MPEG2 sources (such as DVB captures and transport streams) encoding into your favorite MPEG4 format was never as easy as now.
K-Lite Codec Pack is a collection of codecs and related tools. Codec is short for Compressor-Decompressor. Codecs are needed for encoding and decoding (playing) audio and video. This Codec Pack is designed as a user-friendly solution for playing all your movie files. You should be able to play all the popular movie formats and even some rare formats.
Basic contains only the most essential things. It contains everything you need to be able to play the most popular and widespread formats. It is small enough to fit on a single floppy. Also great for including on your movie CDs.
K-Lite Codec Pack is a collection of codecs and related tools. Codec is short for Compressor-Decompressor. Codecs are needed for encoding and decoding (playing) audio and video. This Codec Pack is designed as a user-friendly solution for playing all your movie files. You should be able to play all the popular movie formats and even some rare formats.
Full contains even more codecs. It also has encoding support for various formats. This package is for power users and people who do their own encodings.
QuickTime Alternative will allow you to play QuickTime files without having to install the official QuickTime Player. All QuickTime formats (.mov .qt .3gp etc.) are supported, including streaming content and QuickTime content that is embedded in webpages. Some advantages compared to QuickTime player are the quick and easy install, make an unattended installation, no background processes, use a player of your own choice, low on resources, and smaller size.
Real Alternative will allow you to play RealMedia files without having to install the official RealPlayer. You do need a media player that is capable of playing RealMedia files. The included Media Player Classic supports it. Supported are RealAudio (.ra .rpm), RealVideo (.rm .ram .rmvb), RealText (.rt), and ReadPix (.rp). Not fully supported are: Streaming smil files (.smi .smil) and Realmedia embedded in webpages.
MediaCoder is a free universal audio/video batch transcoder, putting together lots of excellent audio/video codecs and tools from the open source community into an all-in-one solution, capable of transcoding among different audio/video formats with many extra features.