Goblin Camp is more Dwarf Fortressy isn't it?
Supposedly, yes. Haven't played that one yet and not in active development anymore from what I could tell. It just gets me when people are like "Let's make an open source (game/program)!" Usually, if it's popular enough, one or more projects will already be in the works.
I just wanted to list some alternatives that already exist. Of course they won't be exact clones and that's a good thing. Every project provides unique features and ways of doing things. I just wish more commercial projects would actively ask (or at least allow) the community to improve their products freely. Heck, it's free labor, why shouldn't they?
I would love it if Minecraft had an easier way to build and modify mods. For example, if I wanted to modify how long it took for a specific tree to grow from a planted sapling in Minetest, I could modify a single easy-to-read (and find) Lua file that dealt with that process and just reload the game. No complex development environment, build scripts, or even recompiling required. Someone could possibly write a mod for Minecraft that allowed for this kind of simple mod writing and editing (even in other programming languages). Without a standard officially supported mod API, however, it would be a major pain to develop, let alone maintain across game updates.
Thankfully, more games from small companies are at least considering this from the start like TUG.
As a side note, it would be awesome if Feed the Beast supported modpacks for other voxel games ^_^
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