piCSSel-art - Draw pixel art with CSS!
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS
Pixel Art Studio - A purpose-built drawing tool for pixel artists
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Juice FX - Easily turn your pixel art into VFX for your video game.
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.