Blush: Illustrations for everyone
Canva - Amazingly Simple Graphic Design Software
Cleaver
Genial.ly - Logiciel de création de contenus interactifs géniaux
Gliffy.com - Diagram and draw in your web browser
Marp - Markdown Presentation Writer
PowToon : Online business presentation software to create free, cool, animated, powerpoint video alternatives
Presentation Software | Online Presentation Tools | Web Presentations | SlideRocket
Remark
Screencast-O-Matic
SliderWall : jQuery slider, image slider, content slider, header rotator
Speaker Deck - Share Presentations without the Mess