While I was in college, many times I could not present presentations to mass because the lack of projector. Seeing the need app that could help us present presentations even in the absence projectors, I started working on Presentation2.0. The project also got momentum from hackathons, realizing the need of preparing and presenting presentations instantly.
If it meets the guidelines, this might make a good "Show HN".
Guidelines: https://news.ycombinator.com/showhn.html