Below is a listing of various software programs a user could use to view, edit, resize, create and/or otherwise manipulate their image files as well as additional information about each of the programs.

IrfanView
Platform: Microsoft Windows
Capabilities: View and Edit
Additional information: A great freeware software program for viewing a wide variety of different image formats, such as ANI, CUR, B3D, BMP, DIB, CAM, CLP, CPT, CRW, CR2, DCM, IMA, DCX, DDS, DJVU, IW44, DXF, DWG, HPGL, CGM, SVG, ECW, EMF, EPS, PS, PDF, FITS, FPX, FSH, G3, GIF, HDR, ICL, EXE, DLL, ICO, ICS, IFF, LBM, IMG, JP2, JPC, JPG, JPEG, JPM, KDC, LDF, LWF, PICT, QTIF, MNG, JNG, MrSID, SID, DNG, EEF, NEF, MRW, ORF, RAF, DCR, SRF, PEF, X3F, NLM, NOL, NGG, PBM, PCD, PCX, PGM, PIC, PNG, PPM, PSD, PSP, RAS, SUN, RAW, RLE, SFF, SFW, SGI, RGB, SWF, TGA, TIF, TIFF, TTF, TXT, WAS, WAL, WBMP, WMF, XBM, XPM, as well as many video and audio files. In addition to being able to view the images, you can create your own slide shows, change the format and other settings of multiple files at once, and do other minor image manipulations.

Photobie
Platform: Microsoft Windows
Capabilities: View, Edit, and Create
Additional information: A fantastic free image editor that has many of great features found in non-free programs and extra features such as animated GIF creator, supports many of the Adobe filters, and a 3D cube and globe generator.

GIMP
Platform: Linux, Unix, Microsoft Windows, Mac OS, and Other
Capabilities: View, Edit, and Create
Additional information: A great free and open source image editor and viewer that has almost as many features as Adobe Photoshop.

Picasa
Platform: Microsoft Windows
Capabilities: View and Edit
Additional information: A fantastic software program now developed by Google that allows a user easily to view all their images on their computer, make CDs of those images, create web pages from those images, modify the images, and much more.

PhotoPlus
Platform: Microsoft Windows
Capabilities: View, Edit, and Create
Additional information: Another great, free software program capable of viewing, editing, and creating photos and images. In addition to having a free photo editor and viewer, Free SerifSoftware also has free desktop publishing software (PagePlus SE), free web design software (WebPlus), free vector drawing software (DrawPlus), and even a free 3D animation software program (3DPlus). A

Mspaint
Platform: Microsoft Windows
Capabilities: View, Edit, and Create
Additional information: Software image editor included with all versions of Microsoft Windows. Although, it is not capable of viewing all types of images and does not include the most advanced image creation tools. This program is still a good program for users who want to view images or create some basic images.

Adobe Photoshop
Platform: Microsoft Windows, Mac OS, and Other
Capabilities: View, Edit, and Create
Additional information: By far one of the most advanced image editing and creation programs available. This program is for users serious about editing and creating their own images and can cost several hundred dollars.

Of course, these are just a few of the hundreds of different free and commercial image/photo editors and viewers.