Invision - Prototyping and collaboration for design teams
Image to Sketch - Convert images to pencil sketches with AI technology
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Artboard Studio - Online graphic design app mainly focused on product mockups.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
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.