I've been meaning to look at this for a while, and am glad I've finally had a chance. Goblin Camp is - perhaps somewhat obviously - inspired by Dwarf Fortress, but is off doing its own thing, and adds a little Open Source malarkies in the side. In short: running a Goblin camp. While it's early days yet, it seems to be concentrating brilliantly on UI aspects. Frankly, between space-to-pause, h to read help and guess-work I got my little camp up and running. I only had to look at the read-me file to realise that you order production on the Stock Manager (S), and then I was away. It's a really nifty design. If you're interested in the way its heading, here's its future-road map but its worth downloading the current build to get a sense of this city-builder with an orcish twist. A little footage of the UI is below. And I've just made my militarised club-wielding orcs run off and try and escort a unicorn. Awesome!
Thanks for Brian Baird for the heads up.