Recently, I was looking for an in-browser presentation tool that could handle Markdown. After a not so exhaustive search, I found Remark, which fit the bill quite nicely. It not only supports markdown, but also has a presenter mode and a few other nice features.
Unlike more feature rich presentation tools, Remark pretty much stays out of your way while you’re getting your thoughts down; the styling can come later.
Get started by downloading Remark from the project site.