Satish Lele - http://business.vsnl.com/nelcon/ A collection of AutoCAD add-on programs for piping in 2D and 3D, and other AutoLISP routines.
AEC Design Group - http://www.cadpipe.com/ Develops and distributes AutoCAD-based software for the process plant and building services industries worldwide.
PRO-CAD Software Ltd. - http://www.procad-software.com/ Developers of 2D Designer and 3D Smart piping and electrical drafting and design software add-on programs for AutoCAD.
Strucsoft Inc. - http://www.strucsoft.ca/ Plant design software for mechanical, structural, instrumentation and electrical design.
Devpipe - http://www.devpipe.com.br/ An AutoCAD application for generating the intersection profiles between pipe elements of various shapes.
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