XnView MP

XnView is a fast, efficient image viewer that allows you to view your image files in an environment full of options and tools.

XnView includes all kinds of features not found in similar programs. It supports practically any image format and is both multilingual and free.

All of this comes packaged in a simple, attractive interface that may remind you of the famous ACDSee.

Although the program is free, it is truly comprehensive and comparable to ACDSee.