Wired:

Forty years after Apollo 11 landed on the moon, NASA open sourced the software code that ran the guidance systems on the lunar module.

By that time, the code was little more than a novelty. But in recent years, the space agency has built all sorts of other software that is still on the cutting edge. And as it turns out, like the Apollo 11 code, much of this NASA software is available for public use, meaning anyone can download it and run it and adapt it for free.

Now you can be a steely-eyed Arduino-based missile man in the privacy of your own home.

(Via Shah Selbe)