Windows 95

LView Pro	An average image viewer with support for filtering.
Poly View	A good image viewer with slideshow support
Paint Shop Pro	An excellent shareware imaging software.
GIF Construction Set	A good tool for making animated GIFs
Jasc Media Center	Image viewer
Microsoft GIF Animator	A good tool for making animateg GIFs.
Graphics viewers, editors, utilities and info

DOS

SEA	The best image viewer for DOS. The latest version has support for WAVs, Animated GIFs & AVI Files also.