Open Source Ecology 

This site is fairly interesting it is showing a brick press and some other Open source ideas about a village constructed from scratch using 50 types of machines. From my perspective the site have many usefull informations. The technology presented is also free. http://opensourceecology.org/ 

Rep Rap and Open Source 3D printing

This site provide us with interesting open source ideas. This 3D printing technologies become cheaper by the day and also help spread this disruptive technology by creating own parts for the machines. On the net we can observe also construction printing. 
The website is www.reprap.org
It has an extensive blog with interesting ideas