Amethyst ShadowFX - A sun and shadow modelling program for architects and town planners, working with data from DWG/DXF files.

ARCAD - Architectural CAD system for the Linux operating system.

ArCon - A 3D CAD software for use in civil engineering, architecture, and interior design.

Argos Systems, Inc. - Software for construction and design management, with CAD tools for wood and steel frameworks and premanufactured housing.

Artifice, Inc. - Develops and markets DesignWorkshop, an architectural 3D modelling software for Windows and Macintosh.

Autodesk Revit - Revit is a parametric building modeler for architects, with intelligent building components, views, and annotations.

Blocklayer.com - Various geometric online-calculation tools for concrete blocks, stairs, and other construction design tasks.

BOA - Architectural 3D design software for Apple Macintosh systems.

BricsNet - AEC software development company primarily involved with Microstation and Intellicad AEC add-ons and related building industry software

Building Composer - A free, open source, suite of criteria-based building design tools to support architectural programming and conceptual design.