This page lists add-ons to Blender which are most relevant to AEC work.
Some Add-ons without their own pages:
Construction Lines is a tool for accurate CAD style modelling in Blender. Build snapping guide points and guide edges, draw lines and primitive shapes in place, automatically create faces in closed geometry, rotate and precisely move object geometry around a scene and cut shapes into existing geometry. The tool is designed for CAD style drawings but works just as well with any other type of modelling.