Joiners, panos, photo-constructions – many names have been used, and people seem to argue about whichever one you use. I’m settling on ‘panography’ as a reasonably generic term that doesn’t seem to upset too many people. Most of the time, when I do this type of thing, I don’t try to hide the joins and make a perfect ‘panorama’ that looks like a single huge photo. I want the result to look rough and thrown-together. More of an impression of the scene than too much realism. Sometimes, I mix a bunch of photos with lots of different processing applied, some colour, some monochrome.
In terms of software, I mostly use PanoEdit and DoubleTake on my Mac. PanoEdit does good clean stitching very easily, but it doesn’t seem to be available any more. DoubleTake isn’t so good at stitching images cleanly, but hit ‘0’ (the zero key) and it stops trying entirely, leaving you with a really nice easy interface for dragging a bunch of photos around and putting them where you want them. I could do the same things with Pixelmator, or almost any decent image editor, but DoubleTake makes it easier.