X Codec Pack is not just another codec pack. Just the most used (popular) codecs are included. If you are looking for a big pack with lots of codecs, filters, tools, this is the wrong place. Lots of codecs can mess up your Windows. Unlike other codec packs, you can select the components you want to install, you get uninstall support, detection for previous installed versions, update for new versions, support for unattended installs.

X Codec Pack is virus/spyware/adware/toolbars/search engines free.
All the codecs, filters, tools inside X Codec Pack are freeware.

XP Codec Pack 2.5.1

K-Lite Mega Codec Pack 5.8.0

K-Lite Codec Pack 5.8.0 Full/ Corporate/ Standard

Windows 7 Codec Pack 2.5.0

Cole2k Media Codec Pack 7.9.0 Standard/ Advanced

Win7codecs 2.4.2

CCCP (Combined Community Codec Pack) 2009-12-07 Beta

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