MagicaVoxel - A free lightweight GPU-based voxel art editor and interactive path tracing renderer.
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Cubik Studio - Model in a unique cubic style. Start modelization with boxes. Move, rotate and scale cuboids.
PicMonkey - PicMonkey is a feature-rich online photo editor that works right in your browser; no downloads...
SpriteStack - 3D pixelart editor based on sprite stacking technique.
Piktochart - Piktochart for Business Storytelling