I really like the way markdown is implemented in SE bunch of sites, where I can easily write code blocks, performing formatting or even use latex on some of sites like writing $pi$. I also like how this online editor looks and feels. But it's all online.

Is there any offline WYSIWYG analogs of notepag or WMD in Ubuntu that optionally supports pdf as an output format? Both markdown and latex desired.

I desire to simultaneously use Markdown and LaTeX. I'm planing to use an editor for writing some technical stuff with math, but it's annoying to be constantly in "LaTeX-mode". So it would be awesome to immerse in LaTeX when I need formulas and use markdown when I need to speak on natural language.

UPD. Almost all answers was quite useful, but none of them answers directly on my question. I'll accept @N.N. answer as a most complete.