Giftedmotion

GiftedMotion is a small, free and easy to use GIF Animator. Easily design a funny animation from a series of digital images to be used on your homepage or as a forum avatar, without the hassle of learning how to use a full featured graphics software like Adobe Photoshop or The GIMP.
Features:

Written in Java, runs on Linux, Mac OS and Microsoft Windows.

Free to use, no licensing costs. Ideal for making animations to be used on your homepage.
No installation required. Just put the jar file on your Desktop (or any place else) and start it. GiftedMotion will not bury itself into your operation system.

Able to create animated GIFs from the following input image types: PNG, JPG, BMP and GIF.
Easy to adjust size of the resulting animation.
Easy to adjust position of images within frames.
Animation preview.
Full control over all aspects of the animated GIF.
Best dithering results, if working with images of more than 256 colors.
Able to edit existing GIF animations.