The document discusses virtual collaborative design environments and how distributed and collaborative approaches used in open source software, crowdsourcing platforms, and business can be applied to architecture, engineering, and construction. It describes how virtual worlds allow for enhanced testing, feedback, and immersive collaboration on idea generation, design, and manufacturing. Examples discussed include Wikitecture 3.0, which allows open collaboration on 3D architectural models, and different governance models for project collaboration. The future of open source architecture networks is discussed, including opportunities for less experienced designers and improved industry collaboration.