= Open Source Construction Systems (an effort to produce an open source building system, in the spirit of Lego and Meccano). :
URL = http://www.Makerbeam.com
MakerBeam is a "modular construction system based on very simple rules. These are not based on a hole-pattern, but use T-slot aluminium profiles." 
"MakerBeam is a project to build a toy and tool for the open source imagination. Based on Mini-T, a new open source standard, MakerBeam will develop a construction toy for our times: open source precision hardware equally at home doing desktop fabrication or serving as a drawbridged castle for action figures. The fully developed MakerBeam line of connectors will make for an unsurpassed builder's toy and maker kit. Connectors, pivots, hinges, pulleys, cables, wheels, slot-in PCBs, and ALL of it open source, with the models published under Creative Commons licenses."
"The product is very much WYSIWYG, with few opportunities for disappointment. Already sold and delivered the first batch of mini-T slot to tens of customers (?). For development roadmap, can rely on industrial T-slot." (February 2010)