CCAD
Weldsym
Trial versionAutoCAD Tool Simplifies Welding Symbol Creation
WindowsSteel Shapes for AutoCAD
Trial versionAutoCAD Tool for Drawing Steel Shapes
WindowsPfast
Trial versionPfast 2.1: Streamline Hole and Fastener Creation in AutoCAD
WindowseDucts
Trial versioneDucts Simplifies Round Ductwork Design in AutoCAD
Windows