There are a variety of visualization packages suitable for numerical astrophysics applications, ranging from simple 2-D plotters to professional products that support animation and multi-dimensional exploration. This tutorial will concentrate on sm, one of the 2-D varieties, and will touch on a few others. There will also be some brief discussion regarding animations and ray tracing. Above all note that visualization is about graphically conveying numerical information to viewers. As a result, there is a certain artistic element involved that can be hard to master.
A brief word about presentation tools, such as LATEX, xfig, and PowerPoint, is given at the end.