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FastStone Image Viewer

nomacs is a free, open source, cross-platform image viewer. With nomacs you can easily view and manage all common file formats including jpg, png, tif, bmp, raw and many more. The sleek user interface provided by nomacs features a semi-transparent widgets that display additional information such as thumbnails, metadata or histogram.

IrfanView is a commercial image viewer and editor that can be used to orginize and convert images for Microsoft Windows. The application can handle video and audio files, while providing basic image editing capabilities. IrfanView is free for non-commercial use, while commercial use requires payment.

gThumb is a free and open-source image viewer and Image organizer for the GNOME Desktop. The software can be used to view, orginize and edit BMP, GIF, ICO, JPEG, PNG, TIFF, XPM files. An importer tool is also include, it can be used for transferring photos from cameras. With the editing tool, photos can be rotated, flipped and cropped, or optimized for the right contrast ratio. gThumb is developed by the The GNOME Project and released under the GNU General Public License.

IrfanView is a commercial image viewer and editor that can be used to orginize and convert images for Microsoft Windows. The application can handle video and audio files, while providing basic image editing capabilities. IrfanView is free for non-commercial use, while commercial use requires payment.

A versatile and powerful photo viewer, image management, image resize developed by XnSoft. The XnView MP image viewer is a free software for macOS, Linux and Windows. The software consist of a photo viewer and a photo editor. With the photo viewer you can view browse photos in thumbnail, fullscreen and filmstrip view and compare images and manage EXIF, IPTC, XMP meta data. The photo editor can be used to resize, rotate and crop photos or adjust brightness, contrast and color while applying filters and effects to images. 

ImageGlass is a lightweight, versatile image viewing application that is designed for viewing images in a clean and intuitive working environment. It share many similarities with Windows Photo Viewer that shipped with Windows 7 and Windows Vista. ImageGlass provides tools that can be used to conver images to different formats, invluding BMP, EMF, EXIF, GIF, ICO, JPG, PNG, TIFF, WMV and BaseString.