Sometimes I need to prepare a presentation, there are a lot of tools I can use, like keynotes, powerpoint, latex. I used to use latex beamer, it can generate very beautiful slides, and there are a lot of themes to choos. But the latex source code is not easy to write and clear.
I love markdown, which is very popular now, I want to write source code using markdown, and generate a pdf file as beautiful as beamer. There is a powerful tool can do this, it's pandoc(http://johnmacfarlane.net/pandoc/), it can convert one markup format to another, and support most of formats.
Here I use pandoc to convert markdown to beamer
pandoc -V theme:Warsaw -t beamer -o slides.pdf slides.md
I specify theme Warsaw to use with -V option.
pandoc official website show how to wite markdown to producing slides: http://johnmacfarlane.net/pandoc/demo/example9/producing-slide-shows-with-pandoc.html