Construction and Maintenance

AB Studio
CADCON is an extension to AutoCAD or Architectural Desktop for structural and building services design.
http://aec.cadkon.cz/

AC Plant Designer
A plant design and construction toolkit connecting AutoCAD with database functionality.
http://www.acplant.com/

Advanced Graphics Technology, Inc.
Software for Cogo, legal descriptions, TIN models, contours, and sections, based on AutoCAD and LandDesktop.
http://www.agtcad.com/

Alexander Kosov
GEOL_DH for graphical representation of geological, surveyor, mining and calculation data in 3D space. KAI-2001 package for geologists and geophysicists, surveyors and miners, builders-designers.
http://geol-dh.ru/en_index.html

ArchSoft
A 2D application program for AutoCAD and IntelliCAD for producing architectural working drawings.
http://www.grovetec.com/

ArchSymb
Architectural symbols and routines for AutoCAD [requires Javascript for navigation].
http://www.archsymb.com/

Cad Easy Corporation
AutoCAD extensions EasySite for terrain modelling and visualization, and EasySurf for mapping and road development, as well as related symbol libraries.
http://www.cadeasy.com/

CadPoint, Inc.
Provides Structural CAD, a structural engineering design software for steel, wood, and concrete compatible with Audodesk AutoCAD.
http://www.cadpointinc.com/

Computer Services Consultants Ltd.
Manufacturers of the 3D+ parametric 3D structural modeling and drawing application with integrated analysis and design.
http://www.3dplus.info/

Design Master Software, Inc.
HVAC and electrical building design and drafting software for AutoCAD.
http://www.designmaster.biz/

drcauto
Developers of the Smart Architect range of architectural extensions to AutoCAD and AutoCAD LT, as well as a 3D modeller, and a LISP enabler for AutoCAD LT.
http://www.drcauto.com/

FireAcad Design Software
AutoCAD extension for fire sprinkler designers. The program aids in design, hydraulic calculations and material listing.
http://www.fireacad.com/

GlobalCAD
Offers general drafting tools as well as LandARCH, a landscaping application for AutoCAD.
http://www.globalcad.com/products/index.html

InAdire Teknik
Free and commercial AutoCAD LT and MicroGDS add-ons for drawing reinforcement bars and insulation.
http://www.inadire.se/

Inopso GmbH Interoperable Solutions
Offers an IFC-Interface for Architectural Desktop, which allows to exchange architectural data according to IAI standards.
http://www.inopso.com/

KLH Software, Inc.
Architectural drafting system for AutoCAD that provides an array of productivity tools designed to speed the commercial and residential drawing process.
http://www.klhsoftware.com/

LTplant
Electrical, instrumentation, and plant design software for AutoCAD LT, with isometric drafting and BOM functionality.
http://www.ltplant.com/

Michael Tint
MT Section for creating sectional profiles, MT Calculator for calculating volumes, areas, and distances in civil engineering.
http://www.geocities.com/tintmichael/MT_PROG/MT_SECTION.htm

MillLister, Inc.
SmartLister AutoCAD extension to retrieve cut lists and bill of materials from 3D solid model assemblies, for home building and furniture work.
http://milllister.com/

MultiSuite Software
2D and 3D steel and concrete detailing for AutoCAD. Also available as platform-independent incorporating AutoCAD OEM technology.
http://www.multisuite.com/

Roof Builder Tools
A 3D roof modelling shareware for AutoCAD.
http://www.roofbuildertools.com/

Survey, Cogo and Drafting
Surveying, coordinate geometry, digital terrain modelling, and drafting applications for Intellicad and AutoCAD, as well as free autolisp routines.
http://www.cogosoftware.com/

SYCODE
Offers terrain modelling software for AutoCAD and as a standalone product, as well as general meshing software.
http://www.sycode.com/

Trace Software
The Trace Elec Pro electrical schematic solution for AutoCAD, and the Trace Plant Designer package for industrial installation and piping design.
http://www.traceindustry.com/