Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
Invision - Prototyping and collaboration for design teams
Slidebean - Presentations that design themselves
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
Slides - Slides is a place for creating, presenting and sharing presentations. The Slides editor is available right in your browser. Unlike traditional presentation software, like PowerPoint, there's no need to download anything.
Pastel - Sticky note-based feedback collection tool for live websites