KiddoPaint - MS Paint in your browser (with emojis 💃😽🎨)
piCSSel-art - Draw pixel art with CSS!
JS Canvas - Classic MS-Paint redone as a web application
Pixel Art Studio - A purpose-built drawing tool for pixel artists
JS Paint - JSPaint is a web-based Microsoft Paint remake
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.