RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
Pixel Art Studio - A purpose-built drawing tool for pixel artists
JugiPaint - JugiPaint is a painting software with diverse tools for various types of illustration work.
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Ultimate Paint - Ultimate Paint is a full-featured 32-bit Windows graphics program for image creation, viewing and...
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS