Aseprite is an open source program to create animated sprites. Sprites are little images that can be used in your website or in a video game. You can draw characters with movement, intros, textures, patterns, backgrounds, logos, color palettes, isometric levels, etc.

What makes ASEPRITE different? It focuses on pixel editing, to do pixel-art. Indeed, it isn’t a photo retouching tool or a vector graphics editor. Mainly it is a tool to create tiny animations pixel-by-pixel.

http://repo.openpandora.org/?page=detail&app=aseprite