PikoPixel is a free, open-source application for drawing & editing pixel-art images & icons.

Features: * Easy to use * Unlimited undo * Supports multiple layers * Customizable canvas background & grid patterns * Hotkey-activated popup panels * Export upscaled images * Supports linear (gamma-correct) color blending

Originally a Mac app, PikoPixel runs natively on GNU/Linux by using the GNUstep framework.