Vim-slidedown is a project mainly written in Vim Script, it's free.
Vim syntax highlighting for Slidedown
This is a Vim syntax file for the Slidedown presentation software. It requires a Markdown syntax file be installed. I use this one, but it shouldn't matter too much as long as the syntax is named 'markdown'.
All this really does is add highlighting for !SLIDE and @@@
sections. More coming if there is desire. File an issue on GitHub
if there's something you need.
The contents of this repository are released into the public domain.