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

Struc Plus Suite of parametric driven modules that provide tools and macros related to the preparation of structural engineering drawings. http://www.struc-plus.com/

ATG CCM Plus 2000 Software for accessing and editing facility management data in AutoCAD with an integrated MS Access interface. http://www.ccmplus.com/

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

MBA Computing Timber Frame software for the housing and construction industries. Products consist of Construction Designer Modules, as well as training and consultancy. http://www.mbacomp.demon.co.uk/

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

Leica Geosystems TPS-CAD An online data acquisition application for use with AutoCAD and the LEICA TPS300 Series Total Stations. http://www.leica-geosystems.com/surveying/product/software/tpscad.htm

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

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

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

PERI GmbH Offers the PERICAD AutoCAD extension and ELPOS for formwork planning with PERI Formwork and Scaffolding. http://www.peri.de/en/pub/software.cfm

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/

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

Stardsign CAD Solutions Extensions to Architectural Desktop offering utility functions, dormer construction, and layer management. http://www.stardsign.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/

Office Manager for AutoCAD Toolkit for AutoCAD managing office standards for room blocks, layer management, title blocks, and plotting selections [not visible to all browswers]. http://www.dwgoffice.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/

SteelTools Application for steel detaling in AutoCAD, with automatic bill of materials. http://deterset.homeip.net/SteelTools/

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