piskel.pngAdmittedly, there are quite a few tools available for the aspiring pixel artist, but the freshly released, open-source and appropriately freeware Piskel is worth a mention. It's an intuitive drawing and animation app that runs in your browser and can export animated gifs and spritesheets. Piskel comes with an incredibly handy live preview window, supports layers, offers an eclectic selection of useful tools and lets you create your own palettes.