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Allikas: Pingviini viki
/* UGS NX */
*[http://www.ugs.com/en_us/index.shtml Siemens PLM Software]
*[http://en.wikipedia.org/wiki/NX_(Unigraphics) UGS NX Vikipeedias]
=== Bricscad ===
*[https://www.bricsys.com/en_INTL/bricscad/index.jsp www.bricsys.com]
=== LibreCAD ===
2d cad
*[http://www.librecad.org/ www.librecad.org]
