Anything that can export will work, .eps isn't necicary, you can use .jpg or pretty much any image format for that matter (eps are just vectorized images, so they scale nicely). You just need to include the images. Maple may be able to, there's probably a right click context menu export of a figure (its been a while since I used Maple).
I know there's a few ways to graph directly in LaTeX, but they've always seemed overly complicated, and are one of those things you have to look up every time you need them.
Graphics are easy to include, in its simplest form :
\usepackage{graphicx}
.
.
.
\begin{figure}
\includegraphics[]{img/dc-dc-l-graph}
\end{figure}
Tho you can also scale, rotate, center, and annotate:
\begin{figure}
\begin{center}
\includegraphics[scale=.4]{img/dc-dc-l-graph}
\end{center}
\caption[Inductor selection guide]{DC-DC converter inductor selection guide.}
\label{dc-dc-inductor-selection-graph}
\end{figure}
You can also scale relative to the width of the text field in the layout you are using:
\includegraphics[width=.8\textwidth, height=.45\textwidth]{res/car_res/pascar4_simple}\\