MediaCoder v0.3.9 - freeware audio/video transcoder, which includes a lot of different audio and video tools under one program.
MediaCoder's faetures:
??? enhanced vide compression / size reducing (when converting audio and video) from MPG/VOB/AVI/RMVB/MOV/MP4 formats into AVI/MKV/MP4 (Xvid/DivX/H.264 + MP3/OGG/AAC)
??? extracting sound tracks from video files of MPG/VOB/AVI/RMVB/MOV/MP4 formats into MP3/OGG/AAC/MPC
??? converting VCD/DVD from RMVB/MOV to MPEG 1/2
??? converting from lossless formats or high bitrate files APE/FLAC/WavPack (+ CUE sheets) into MP3/AAC/WMA for playing into portable players
??? copying and compressing audio tracks into APE/FLAC/WavPack/MP3/OGG/AAC/WMA/MPC

Undates:
??? MediaCoder updated to build 1885
??? fixed audio delay option bug
??? added playback with MPUI
??? fixed WMA encoding breakage
??? fixed and improved Time tab
??? added mobile phone transcoder (still under dev)
??? added showing details of transcoded file function in "Item" menu
??? fixed some subtitle bugs, DVD Chinese subtitle can now display properly
??? fixed a bug in "Add Track" dialog
??? fixed a bug that causes QPEL mode forced with XviD encoding
??? added down sampling only mode for resampling
??? fixed a audio resampling bug
??? fixed a bug in Winamp input plugin source
??? fixed some issues in PSP transcoder
??? added a menu item to show up web-based preference
??? updated PMP muxer to version 2.01
??? integrated (portable) Mozilla Firefox (some UI will be rendered with it in the future)
??? added mp3PRO decoding (with Winamp plugin)
??? Helix Producer now excluded from Full Pack and can be installed by downloading additional installer


Download MediaCoder v0.3.9 here

DivX 6 (DivX Media Format) - popular codec has been updated. In a new version DivX consists of 2 components: DivX 6 Play Bundle - for playing all types of DivX movies, including new DivX Media and DivX 6 formats, and DivX 6 Create Bundle - includes DivX codec and DivX converter - for converting videos.
DivX 6 Play Bundle
DivX 6 Create Bundle

K-Lite Codec Pack Full 2.49 /K-Lite Mega Codec Pack 1.33 - codec packs have been updated. With this codecs you will be able to watch 99% of your movies.
Download K-Lite Codec Pack Full 2.49 /K-Lite Mega Codec Pack 1.33

K-Lite Codec Pack 2.47 - one of the best codecs set has been updated. As usual they updated all main codecs.
What's new in K-Lite Codec Pack 2.47:
* Updated MP4 DirectShow splitter to build 2005-05-03 * Updated Matroska DirectShow splitter (made by Haali) to build 2005-05-03 * Minor changes

Download K-Lite Codec Pack 2.47

K-Lite Codec Pack 2.46 - one of the best codeck packs in the net. K-Lite Codec Pack supports all necessary and stable codecs. K-Lite Codec Pack also includes Media Player Classic.
Download K-Lite Codec Pack 2.46

K-Lite Mega Codec Pack 1.29 - new updade of a popular codecs set.
Latest Changes: BSplayer default video output is now set at Overlay Mode2 Updated ffdshow to build 2005-04-06 Updated MP4 DirectShow splitter Updated Matroska DirectShow splitter Removed Nero Digital MPEG-1/2 audio decoder Minor changes
Download K-Lite Mega Codec Pack 1.29

K-Lite Mega Codec Pack 1.20 - this mega package includes K-Lite Codec Pack Full, QuickTime Alternative, Real Alternative, Monkey's Audio DirectShow decoder + feature to play Bink and Smacker and much more.
Download K-Lite Mega Codec Pack 1.20 here

K-Lite Codec Pack 2.40 had been updated.
Download K-Lite Codec Pack 2.40 full here
Download K-Lite Codec Pack 2.40 standard here
Download K-Lite Codec Pack 2.40 basic here

XP Codec Pack 1.1.0 - new version of the codec pack. XP Codec Pack 1.1.0 includes AC3Filter 1.01a RC5, FFDShow MPEG-4 Video Decoder 2004.10.12, Matroska Splitter 1.0.2.5, Media Player Classic 6.4.8.3, OggSplitter/CoreVorbis 1.0.0.0 and other codecs.
XP Codec Pack 1.1.0

XP Codec Pack 1.0.3 - a big set of codecs for every need. XP Codec Pack 1.0.3 is a freeware.
Download XP Codec Pack 1.0.3 here