IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Pixelator - Convert any picture into pixel-art sprites!
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
PixaTool - Convert any image or video into pixel art 👾
VistaCreate - The VistaCreate is a free and global digital platform which is known for sharing, searching, finding, and creating great art.
SLK_img2pixel - Convert images/textures to pixel art