Video/Codecs
freeware
K-Lite Codec Pack
K-Lite Codec Pack is a collection of codecs and DirectShow filters. Those components are needed for encoding and decoding various audio and video formats. This Codec Pack is designed as a user-friendly solution for playing all your movie files.A bundle of 64-bit DirectShow filters for use with 64-bit players.
freeware
QT Lite
QT Lite is a lightweight version of QuickTime. Contains only the essential components required for playing QuickTime videos in your favorite web browser.
freeware
K-Lite Mega Codec Pack
K-Lite Codec Pack is a collection of codecs and DirectShow filters. Those components are needed for encoding and decoding various audio and video formats. This Codec Pack is designed as a user-friendly solution for playing all your movie files.K-Lite Mega Codec Pack combines the contents of two packs: K-Lite Codec Pack Full and Real Alternative.
freeware
CCCP (Combined Community Codec Pack)
CCCP (Combined Community Codec Pack) is a filter pack specifically built for playing anime. It has been assembled by some of the most knowledgeable people in the anime world, and one of the primary design goals is to play as much possible with as little as possible. It attempts to be as unintrusive on your system as possible.
freeware
Vista Codec Package
With Vista Codec Package installed, you won't need to install any other codec or filter. Many user suggested default settings are implemented. It does not contain a media player. It does not associates filetypes. With this package installed you will be able to use any media player (limited only by the players capabilities) to play DVD's, movies and video clips of any format. Streaming video (real and quicktime) is supported in web browsers. Visit the homepage to get a 64bit Addon which enables xvid, divx...
open source
XviD
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.
freeware
GSpot
GSpot identifies presence or absence of "B-VOP", "Qpel", and "GMC", thus allowing the user to determine if a DivX5 file is compatible with KISS and other popular hardware DivX players. Provides information about MPEG1 or MPEG2 video and/or MPEG1 or MPEG2 audio either as "elementary" streams or multiplexed into an MPEG1 "system stream" or an MPEG2 "program stream". Limited support for MPEG4 video when contained in an AVI stream, such as DivX5.