Allegro Sprite Editor

Allegro Sprite Editor is an open source program to create animated sprites and pixel art. 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, and isometric levels. It features undo and redo for every operation, multiple editors support, import and export Sprite Sheets, pixel art specific tools like filled Contour and Polygon, and onion skinning.