SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...
Media Preview - Fed up with Windows Explorer not always showing thumbnails for all of your media files?
MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.
K-Lite Codec Pack - K-Lite Codec Pack is a collection of codecs, DirectShow filters and tools.
Icaros - Icaros is a collection of lightweight, high quality, Windows Shell Extensions
Kawaii Codec Pack - Tired of bad media playback? I bring to you the ultimate solution: KCP