Provides a free service to share and collaborate with drawings and image documents over the web. Actual data files are not transferred, only displayable representations. http://www.drawingroom.net/
CAD converter software (CATS and DGNLink) and translation services for data exchange between AutoCAD (DWG, DXF) and MicroStation (DGN) CAD systems. http://www.dgnlink.com
Software and solutions for CAD/CAM data interoperability, including CAD data viewers, markup tools, and translators [requires Javascript for navigation]. http://www.cadcentric.com/
EMSA is a nonprofit organisation which promotes data exchange standards within the marine industries. EMSA submits members' requirements to standards such as ISO STEP, and publishes its own industry standards. http://www.emsa.org/
DrawEx is a CAD symbol and drawing exchange where users can buy and sell CAD files, as well as request or bid on development proposals. http://www.drawex.com