There was one abandoned work by Tolkien set in Gondor during the Fourth Age, after Aragorn died (during Eldarion's reign). It's only about 12 pages long and can be found in Part Three of
The Peoples of Middle-Earth (HoME 12) under the title 'The New Shadow'. Basically it's about a couple of Gondorian kids who are bored and start acting like orcs and creating havoc. Tolkien disliked the story and discontinued it, as he didn't see it able to be portrayed as anything but a 'cheap thriller'. Worth a read, though. In fact, I think you can even read it somewhere online. Hope that helps
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