REX for R13 is a small free plugin for AutoCAD to add some rectanlge enhancements.
It contains these functions:
Pick first point and then another to create a simple rectangle ,
If you choose to fillet it it will use current fillet radius (FILLETRAD).
It improves on AutoCAD's RECTANG command in that it ignores OSNAP mode.
Create a rectangle with a "shadow" (will be improved soon).
Create a filled rectangle
Rotate a rectangle enclosed selection
Create variations of elevation windows
Create a rectangle by specifying its dimensions and then its location.
Create a Trapezoid . Specify both base length + its height.
Calculate a rectangle area. This is done by either touching the rectangle , pointing inside it or defining a rectangle.
Create a closet - now 2 options - simple or detailed. detailed may have its door width marked
Create an elevation door easily. The doors also have the openning dirsetion marker put in layer "HIDDEN"
which may have linetype "HIDDEN" assigned.
Enter a distance and final area and REX will draw the rectangel (handy when you need to approximate a room area or dimensions)
Set some of the parameters.
Mark rectangle holes in plans.
You can dimension a room by picking both corners and the result is "horizontal / vertical" and
below the area (the suffix must be set in settings.