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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
PosterMyWall - PosterMyWall is a free online app that simplifies graphic design for marketers and businesses.
Sculptris - Sculptris: Enter a world of digital art without barriers.
EDIT.org - EDIT, design online very easy in a few clicks.
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.