Showoff is a slideshow presentation tool with a twist. It runs as a web application, with audience interactivity features. This means that your audience can follow along in their own browsers, can download supplemental materials, can participate in quizzes or polls, post questions for the presenter, etc. By default, their slideshows will synchronize with the presenter, but they can switch to self-navigation mode.
Showoff allows you to author your presentation slides in Markdown, then organize
them with a showoff.json file. This file also contains metadata about
the presentation, such as the title, any password protection, etc.
Then you just run showoff serve in the presentation directory and open
a browser window.