CNC mill a livable house.
WikiHouse is a new project trying to make house construction open source. With WikiHouse anyone could download plans to CNC mill and assemble a house. The system relies on standard 2440mm x 1220mm (8′ x 4′) 18mm plywood. Besides a CNC mill, you only need basic hardware and hand tools. The plans can be altered in Google Sketchup and new designs can be offered back to the community.
There have been many open source projects over the last few years, but most focus on digital technology or, to a lesser extent, small scale physical products. Larger construction brings with it imposing practical challenges. WikiHouse is one of the few to try and overcome these challenges.
WikiHouse is still in the early stages, so the plans are not yet available for download. The organizers are currently looking for collaborators, so have a look at the site if you are interested.