Extended Offset - Multiple Offset with ability to offset on left/right and both sides. You can set an unlimited number of offset values.

Creates direction pattern for steep slopes. The Pro version has some extra features compared to the free version.

BLi (Block Line Insertion): This tool will insert blocks in interval distances on the selected items.

The MEPcontent Browser gives access to MEPcontent.com, the largest BIM library, directly from your project! Uniform content of high quality for MEP engineers, contractors, and designers.

Automatic polyline layout and routing for a selection of blocks and intersecting polylines, arcs, splines, and lines.

Draws automatically trimmed and filleted polylines and splines between blocks.

SDUCT allows you to create double line HVAC ductwork in Autodesk® AutoCAD®.

A collection of automation tools and an extensive block library which simplifies the creation of drawings that conform to the PWGSC National CADD Data Standard.

This is a great library of AutoCAD® Clock symbols. There are CAD symbols of clocks including wall clocks, mantel clocks, tavern clocks, floor clocks, and longcase clocks.

CADsecurity Signature helps you to place watermarks and well-hidden signatures in your drawing as prevention or protection against unauthorized copying of a drawing's parts.