Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
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.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
PicMonkey - PicMonkey is a feature-rich online photo editor that works right in your browser; no downloads...
Invision - Prototyping and collaboration for design teams
Piktochart - Piktochart for Business Storytelling