SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...

Converter365 - Convert all your files the easy way with converter365.com

MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.

NEFconverter - NEF is a proprietary Nikon RAW image format that you need to convert to JPG, or some more usable format, to send or print. Since NEF uses lossless compression and contains metadata from the camera sensor, it is also referred to as digital negative.

Icaros - Icaros is a collection of lightweight, high quality, Windows Shell Extensions

CR2toGPGconverter - If you need to open, edit or print the images from your Canon DSLR that are in CR2 format, you’ll have to convert them in JPG or some more accessible image format.