LaTeX.org

Notepad++ is an awesome editor. I love programming with it.

Unfortunately the built-in code highlighting for (La)TeX doesn't recognize and color math environments, such as $M$ , \[ \exp(i z) = \cos(z) + i \,\sin(z) \] or
\begin{align}
\exp(z) := \sum_{n = 0}^{\infty} \frac{z^n}{n!}
\end{align ...