Darpa’s software — built in part by researchers at Vanderbilt University — is called Meta. It’s an open source version of the same kind of complex design and simulation software that typically costs big corporations tens or hundreds of thousands of dollars, says Lt. Col. Nathan Wiedenman, the Darpa program manager in charge of the challenge.

The code will be released Monday at noon EST, and the first phase of the contest — called the FANG (Fast, Adaptable, Next-Generation Ground Vehicle) challenge — will kick off. Contestants will use this code to build a drive train and mobility system, Wiedenman says.

Darpa plans to continue to refine the code as the FANG challenge evolves. And, eventually, it will also release the source code to the Vehicleforge.org website that it’s using to manage the contest.

Once the drive train is built, the field gets winnowed a little bit, and the top 20 contestants will then design more of their amphibious vehicle. Contestants will move forward based on how well they meet about 150 design goals of the drive system.

When the $1 million prize winner is finally selected a few years from now, Darpa will try to build out the top design. But of course, they won’t do this in a standard way. According to Bloomberg BusinessWeek, they’re investing $3.5 million in Washington, D.C. and Pittsburgh hacker spaces where Darpa employees will literally work by night, building a new kind of reconfigurable foundry where they’ll be able to quickly spit out prototypes of the parts they’re creating.