Offset Line to Midpoint — Jan Bath — A nice little AutoCAD routine to offset a line — and this one has a twist. Once you pick two lines, this routine will draw the new line midway between the existing two.
Hatch Creator — Raymond Rizkallah — A unique AutoCAD routine that can generate hatch patterns on the fly.
Swap Attribute Values within the Same Block — Patrick Evangelista — SwapAtt is a function that will push attribute values from a certain tag into other tagged attributes in AutoCAD. It is designed to be used inside other LISP functions. Generate User-Defined Closed Areas — Juan Villarreal — This routine projects points and generates closed polylines in AutoCAD according to a user-defined area and number of areas.
Create a Nonplotting Layer — Leland Leahy — Frequent contributor Leland Leahy uses this routine to create an AutoCAD layer like defpoints, meaning that it will display on screen but not plot. You can use this as a guide for creating your own layers via code too.