I’ve covered the program 3DEM before on this blog; it’s a first-rate 3D terrain visualization program, and does the best out-of-the-box map relief shading of any free program I know. Here’s a standard USGS topo shaded with a digital elevation model using this program:
Unfortunately, the author, Richard Horne, has ceased development of the program, and shut down the website permanently. But he’s graciously given me permission to host the last version of the program (version 20.7) here on Free Geography Tools; you can download it here. It comes with a full PDF manual, and my posts may offer additional insight on using it. I can offer some limited help if you run into problems, but any bugs in the software are there to stay.