Highly evolved engine based on id Software technology, available under dual license (GPL, proprietary licensing for commercial use available).
Shodan, up to her tricks again, has prevented Citadel from being released this December 23. But don't fear! Hacking on Citadel is going very well.
After almost 2 weeks of hard work, we are presenting you with the alpha 0.06a which have bunch of under the hood improvements, and features a mini-boss!