ANIMATIONS
Pencil - create traditional hand-drawn animation
Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.
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Two-dimensional animation has long been the domain of proprietary software. That changes with the introduction of Synfig, a free software/open source tool for producing feature-film quality animation with fewer people and resources.
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Microsoft GIF Animator lets you easily create and customize animated GIF files for your Web site.GIF animations are based on the GIF89a file format, which stores timing information to create the illusion of animation like a cartoon "flipbook". With GIF Animator you can make your animations loop, spin, fade in and out; set the size and transparency of your images; and control a wide range of other options. GIF Animator also features automatic or custom palette creation.
Comes standard with Operating System
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Pivot makes it easy to create stick-figure animations. You can build your own stick figures and load your own backgrounds. The animations can be saved as animated gifs to be used on web pages.

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SYNFIG - 2D Animation
Microsoft GIF Animation
Pivot Stickfigure Animator