IrfanView is trying to create new and/or interesting features in its own way, unlike some other graphic viewers, which whole "creativity" is based on feature cloning, stealing of ideas and whole dialogs from ACDSee and/or IrfanView!
(for example: XnView is stealing/cloning features and whole dialogs from IrfanView, since 5+ years).
 

IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support. One of the first graphic viewers WORLDWIDE with Multipage TIF support. The first graphic viewer WORLDWIDE with Multiple ICO support.

IrfanView Features

• Many supported file formats
• Thumbnail/preview option
• Slideshow (save slideshow as EXE/SCR or burn it to CD)
• Show EXIF/IPTC/Comment text in Slideshow/Fullscreen etc.
• Support for Adobe Photoshop Filters
• Fast directory view (moving through directory)
• Batch conversion (with image processing)
• Multipage TIF editing
• Email option
• Multimedia player
• Print option
• Change color depth
• Scan (batch scan) support
• Cut/crop
• IPTC editing
• Effects (Sharpen, Blur, Adobe 8BF, Filter Factory, Filters Unlimited, etc.)
• Capturing
• Extract icons from EXE/DLL/ICLs
• Lossless JPG rotation
• Many hotkeys
• Many command line options
• Many PlugIns
• No registry changes without user action/permission!
• and much much more

Updates : IrfanView Updates