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.
Loops Feedback - Feedback on design ideas in minutes via 110m+ people
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.
Storydoc - Easily generate interactive decks and presentations that increase lead engagement and conversion
Slidebean - Presentations that design themselves
Feedback by Pixelic - Painless design feedback and version control.