Binary package “aseprite” in ubuntu trusty

sprite and pixel art editor

 ASEPRITE (aka ASE, Allegro Sprite Editor) is an open source program to
 create animated sprites & 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,
 isometric levels, etc.