Tworlds - Swap photos with strangers around the world, anonymously
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.
Just a Minute - A web experiment to see how well you can estimate a minute.
Google Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
The Evolution of Trust - an interactive guide to the game theory of why & how we trust each other
Keynote - Keynote for Mac, iOS, and iCloud lets you make dazzling presentations. Anyone can collaborate — even on a PC. And it’s compatible with Apple Pencil.