Aseprite

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Aseprite is an open source program to create animated sprites.

Its main features are

• Sprites are composed by layers & frames as separated concepts.
• Supported color modes RGBA, Indexed palettes up to 256 colors, and Grayscale.
• Load/save sequence of PNG files and GIF animations and FLC, FLI, JPG, BMP, PCX, TGA.
• Export/import animations to/from Sprite Sheets.
• Tiled drawing mode, useful to draw patterns and textures.
• Undo/Redo for every operation.
• Real-time animation preview.
• Multiple editors support.
• Pixel-art specific tools like filled Contour, Polygon, Shading mode, etc.
• Onion skinning

WWW https//www.aseprite.org/