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http://www.microspot.com/products/macdraft/index.htm

The right tools for the job whatever it may be
The Tool palette offers a full complement of drawing tools including lines, rectangles, circles, arcs, polygons, curves, parallel line and freehand tools.

Parallel line and polygon tools make it easy to create exterior walls. Add interior walls with a mouse click using the parallel extrude tool. Some tools can be configured from the Tool Palette to provide several drawing options. For example, arcs can be drawn by their radius, any 3 points, or as an elliptical arc.

There are also special tools to create lines tangent, perpendicular, and parallel to edges. Alternatively, lines can automatically be drawn from the center of an object, as well as from the middle or end points of a line or edge of an object.

A dimension tool for every occasion
Whether you need horizontal, vertical, diagonal, angular, perpendicular, radial or diameter dimensions, MacDraft's dimension palette is always on hand to provide them. With linked dimensioning to automatically update dimensions as you modify components. Dimension formats provide text position, tolerances, round off, witness lines, arrow position, and much more. You can also create linear dimensions in single, chained or baseline modes