Siemens PLM Software is a computer software company specializing in 3D & 2D Product Lifecycle Management software. The company is a business unit of Siemens AG, and is headquartered in Plano, Texas.HistoryEvolution of Siemens PLM from UGS : 1963 to 2007The first commercial product developed by what is now known as Siemens PLM Software was called UNIAPT, released in 1969 by a software company then called United Computing. UNIAPT was one of the world's first end-user CAM products. United Computing was founded in 1963 above a hair salon in Torrance, California, and went on to purchase the Automated Drafting and Machining (ADAM) software code from MGS in 1973. The code became a foundation for a product called UNI-GRAPHICS, later sold commercially in 1975 as Unigraphics.The following year, United Computing was acquired by the aerospace company McDonnell Douglas (now part of Boeing), who created new CAD/CAM divisions, naming one the Unigraphics Group. Finally, in 1980, Unigraphics was released, marking the group's first true 3D modeling hardware and software offering. Already home to McDonnell Douglas, the Unigraphics Group grew in St. Louis, Missouri, which became the new headquarters.