XnView is a utility for viewing and converting
graphic files.

It has the features :

Import about 400 graphic file formats
Export about 50 graphic file formats
Multipage TIFF, Animated GIF, Animated ICO support
Image IPTC, EXIF metadata support
EXIF auto rotation support
IPTC editing
Resize, rotate, crop support
Lossless rotate & crop (jpeg) support
Adjust brightness, contrast...
Auto levels, contrast
Modify number of colors
Apply filters (blur, average, emboss, ...)
Apply effects (lens, wave, ...)
Fullscreen mode
Slide show with effects
Batch convert, batch rename
Create WEB page easily
Screen capture
Create contact Sheet
Create or edit Multi-page file (TIFF, DCX, LDF)
TWAIN & WIA support (Windows only)
Print support (Windows only)
Drag & Drop support (Windows only)
Compare image side by side
Filmstrip layout
44 languages support (Windows only)
And many many other things...
No Adware, No Spyware

XnView is provided as FREEWARE for private non-commercial or educational use (including non-profit organization)

Note : For commercial use, it is necessary to register. It is a help for the development of future versions. XnView for Linux, FreeBSD are FREE also for commercial use.