There are a lot of similar implementations, but nothing really comes close to replicating the full mechanics of the actual game. Probably because the game is so easily decompiled that most people don’t see a need.
I really want to like Org mode, but I just can't. The syntax feels too out of place. With markdown it's just a few extra symbols, but using Org mode feels like writing LaTeX in a way.
Same thing with MediaWiki - I love the wiki system but WikiText is just so bad.
Although I agree that it should probably better state it's products intention; I don't see why you would think it's a software, as the graphics show an external keyboard and it heavily advertises larger screen space.