Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
MagicaVoxel - A free lightweight GPU-based voxel art editor and interactive path tracing renderer.
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS
Goxel - Goxel is a simple, but powerful voxel graphic editor with 24-bit color support, unlimited scene...
Trixel - Instagram for triangular pixel art
Cubik Studio - Model in a unique cubic style. Start modelization with boxes. Move, rotate and scale cuboids.