KiddoPaint - MS Paint in your browser (with emojis 💃😽🎨)
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
GIF Paint - Like MSPaint… for GIFs.
Pixel Studio - The Pixel Art Is Always Fun
JS Paint - JSPaint is a web-based Microsoft Paint remake
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS