Slice Up Solids — Raymond Rizkallah — A nice little routine that contains two functions for performing a slice operation on 3D objects. 

Thaw Layers by Selection — Kent Cooper — This LISP code allows you to thaw a frozen layer by selection, so you do not have to know the name or anything else about the layer. This routine also works to turn on layers that are turned off.

Convert Units for the Offset and Circle Commands — Jan Bath — Convert imperial to metric or vice versa with these commands that are built around the Offset and/or Circle commands.

LISP Learning Routine — Benzigar Peter — The LISP file author submitted this routine as a learning tool for LISP novices, to demonstrate how to create simple objects and manipulate them using built-in AutoCAD commands.  

Copy or Move Objects Quickly — Sam Lucido — Sam's latest routine is very simple, but it can save you some clicks when performing a move or copy. Even if you don't make use of these particular commands, this routine may lead you to build your own command shortcuts for tasks you perform frequently.

Draw a Fenceline — Robert Zipprich — This routine inserts correctly rotated blocks along existing lines to form a fenceline, and comes with an X-shaped block.