XnView is a utility for viewing and converting graphic files. Support of more than 500 graphics formats. XnView exists for Windows, MacOS X, Linux x86, Linux ppc, FreeBSD x86, OpenBSD x86, NetBSD x86, Solaris sparc, Solaris x86, Irix mips, HP-UX, AIX. The most important features are: Import about 500 graphic file formats and Export about 50 graphic file formats.

Features:
- Import about 500 graphic file formats - Export about 50 graphic file formats - Multipage TIFF, Animated GIF, Animated ICO support - IPTC, EXIF - Resize - Copy/Cut/Crop - Adjust brigthness, contrast... - Modify number of colors - Apply filters (blur, average, emboss, ...) - Apply effects (lens, wave, ...) - Fullscreen mode - Slide show - Picture browser - Batch convert - Thumbnail create - Screen capture - Contact Sheet create - Multi-page file create (TIFF, DCX, LDF) - TWAIN support (Windows only) - Print support (Windows only) - Drag & Drop support (Windows only) - 44 languages support (Windows only)
And many many other things.