K-Lite Codec Pack:
Basic - http://www.codecguide.com/features_basic.htm
Standard - http://www.codecguide.com/features_standard.htm
Full - http://www.codecguide.com/features_full.htm
Mega - http://www.codecguide.com/features_mega.htm
Vista Codec Package - http://shark007.net/vistacodecpackage.html
Windows 7 Codecs - http://shark007.net/win7codecs.html
Windows 8 Codecs - http://shark007.net/win8codecs.html
x64 Components addon - http://shark007.net/x64components.html
ffdshow - http://sourceforge.net/projects/ffdshow-tryout/
CCCP (Combined Community Codec Pack) - http://www.cccp-project.net
AC3Filter - http://ac3filter.net/projects/ac3filter
XP Codec Pack - http://www.xpcodecpack.com
Windows Essintials Codec Pack - http://www.mediacodec.org
Codec - http://m5studio.internetdsl.pl
x264 - http://www.x264.nl
X Codec Pack - http://xcodecpack.net
LameXP - http://lamexp.sourceforge.net
Xvid - http://www.xvid.org
Cole2k Media - Codec Pack:
Standard - http://www.cole2k.net/codec-pack-standard.html
Advanced - http://www.cole2k.net/codec-pack-advanced.html
Satsuki Decoder Pack - http://yatoshi.com/en/