MS-GIF animator Simple to use, and that it's free is good but there is not so much more either. If you just should do a simple animation this could be your chioce, becuase here is all the basic features anyway.
GIF const. set

Ulead GIF Animator Windows (32-bit)
Ulead GIF Animator is an extremely intuitive, easy to use tool for designing, producing and optimizing GIF animations. Ulead GIF Animator has quickly become the industry standard.

Ulead Web Razor Windows (32-bit)
This suite of integrated utilities is THE answer to image design, production, optimization, management and image HTML-ization for Web page creation.

GIF Movie Gear Windows (32-bit)
combining an intuitive interface with powerful optimization and manipulation tools, GIF Movie Gear makes GIF animation building easy. This is a professional level tool for the professional Web designer or those who want to be.

CPIC (CompuPIC) Windows (16-bit)  Windows (32-bit)  Macintosh (68k processor)  Macintosh (PowerPC)
CPIC - The all in one graphics utility: View, thumbnail browse, convert, catalog, crop, edit, print, create slideshows, make wallpaper and screensavers -- all with unmatched multitasking speed!

Applet Marquee Wizard Windows (32-bit)
With the Applet Marquee Wizard anyone can easily create smooth scrolling Java banners. These applets can easily be integrated into any web page without any programming experience.