Pixel Art Programs Ubuntu. Additionally, i have a couple of guideline scripts that allow you to put guidelines every x pixels or every x percent. It is a completely free linux tool for a digital artist irrelevant to the level of expertise.
Pixel art is fundamental for understanding how. I've seen krita and pinta, but they do not fit what i want. Gimp can colour individual pixels but i don't recall if you can show a pixel grid or not.