takes a two-dimensional image and creates a three-dimensional "fly around" model, giving the viewers access to the scene's depth and a range of points of view.
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page.
adaption of the H. G. Wells classic War of the Worlds in comic form by Ian Edgington and D'Israeli (merges 1800 version with some designs from the more recent movie)
A bit more feature powered than Zamzar. With more formats and a bit more complicated interface. However, I can guarantee you that it’s worth the usage. No email needed. 100Mb limit
an online accessibility testing tool designed to visually convert a full-color web page into a grayscale rendition for the purpose of visually testing the page’s perceived contrast.