Thank you for the suggestions, I added them and links to the other engine's websites to the post. I meant to put the links to them in the post all along, but I forgot it at some point. Whoops.
There was one problem, however: for some reason, Narrative Game Engine did not run for me (runtime error 339, something about COMCT332.OCX being missing or invalid). I tried XP compability mode, running it as administrator and downloading it again, but none of it helped. Because of this, I was unable to get a screenshot of the engine in action. If anyone else can take one (4:3 like the rest of the screenshots, please), it would be appreciated.