Prezi is a famous presentation platform that is based on Saas (Software as a service) and known for its Zooming UI. What distinguishes Prezi from other web application is its ability to allow users to seamlessly zoom into certain parts of the presentation in a convenient manner. While Prezi is an excellent web app, it can cost users as much as $159 (a year) to use it. If you are looking for a free alternative to Prezi, then try Impress.js and Impressionist Editor. Impress.js is a free presentation tool inspired by the Prezi platform that can be used for creating attractive presentations. Furthermore, you can utilize the Impressionist Editor for creating and editing presentations with impress.js.