Handy AutoCAD-3. Quick Hatch
Quick Hatch - the FREE set of AutoLISP and VBA commands for quick Hatching in AutoCAD using auto assignment of hatch parameters.
The program also includes custom Hatch pattern for adding rail pickets in drawing, which is a time consuming task. Array-copy-trim-extend combination of commands can be replaced with one hatch command. Area of added pickets is flexible for modifications (associative hatch).
Download program at: http://www.nyacad.com/Download.htm
Other samples (images):