Would anyone be interested in an open source Dwarf Fortress? It'd be a shameless borrowing of ideas from the original, but with extensibility in mind. Given it'd be open source, I'm not sure how to kick back to the Toad, but that's by the by. That would be a founding principle though, anything of value generated from it would get kicked back up to support the originator. I just think its too much of a great game to be hobbled by the bottleneck of one person coding. Many eyes make most bugs shallow etc.
I'm thinking of using Slick2D as the game engine - I was thinking of a JavaMonkeyEngine one with a top down view, but the modelling effort is just a killer for me. So still a 2D effort, but possibly particle emissions etc etc and all the other things that'd make it nice. Though a 3D JME one would be nice.
A lot of interesting coding challenges involved, the A* pathing I guess, multithreading for modern CPU's, mod support and hooks from the outset etc.
It's something I'd like to do as a challenge, and more so after being really frustrated with the game as it stands - I think its great, and brilliant work has been done on it, but I'd like to see an open source version where many eyes make light of any bugs, and modders can really open up, not just edit raws and work around issues.
Most of it strikes me as fairly easy (the UI with Slick and TWL), but definitely some work wrt to pathing, optimizing the 3d space etc. I wouldn't be keen on bothering with adventure mode, that's a leach and sideline that (to me) is unnecessary and would cloud the codebase. Of course, people keen on adventure mode would disagree.
The engine itself wouldn't be dwarf based though, that's fairly important - it'd be a generic sim fantasy one, where you could play the race of your choice. I'd like to add in elements like, for instance, Eve Online, where you could search out lost ruins or caves and combat the insiders for potential treasure or upgrades (procedurally generated), as well as open up the world, so you could do multiple fortresses i.e. one might specialize in building, one in military training etc.
A sense of progression would be vital too, I think that lacks in the DF current. At the moment its kind of black or white to me: to do the early stage fort, and that can be interesting, or you're safe, and from then on in its pretty boring, even with current mods.
Anyway, just musing.