I just resurrected and cleaned up an old tool I had lying around. It's now nice and usable by others. This tool loads terrain data, and renders it from the ground, simulating what a human or a camera would see. This is useful for armchair exploring or for identifying peaks. This was relatively novel when I wrote it >10 years ago, but there are a number of similar tools in existence now. This implementation is still useful in that it's freely licensed and contains APIs, so fancier processing can be performed on its output.