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nomacs is a free, open source image viewer. You can use it for viewing all common image formats including RAW and psd images.
The software will run on most popular OS such as Microsoft® Windows®, Mac® OS X®. Linux, BSD and others.
Trademark Note 1: Microsoft®, Windows® and other product names are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
Trademark Note 2: Mac and OS X are trademarks of Apple Inc., registered in the U.S. and other countries.
Note: You can download the other OS nomacs versions from the official nomacs download page here.
nomacs features semi-transparent widgets that display additional information such as thumbnails, metadata or histogram. It is able to browse images in zip or MS Office® files which can be extracted to a directory. Metadata stored with the image can be displayed and you can add notes to images. A thumbnail preview of the current folder is included as well as a file explorer panel which allows switching between folders. Within a directory you can apply a file filter, so that only images are displayed whose filenames have a certain string or match a regular expression. Activating the cacher allows for instantly switching between images.