piCSSel-art - Draw pixel art with CSS!
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Pixel Art Studio - A purpose-built drawing tool for pixel artists
Pixilart - A drawing app for delightfully retro pixel art
Pixel Art Together by Liveblocks - Pixel Art Together is a multiplayer pixel art editor, allowing up to 20 people to create art on the same canvas, at the same time.
Piskel - Piskel is a website where designers online create sprites or pixel art.