NS was the Electronics Design Automation (EDA) software written by Jim Cherry, Neil Mayle, David Tan, Clark Baker and Neil Weste for the Symbolics Lisp Machines.

While the software was originally developed and owned by Symbolics, Chris Terman, Doug Leonard, Neil and Bruce Davis founded TLW Inc. and later exchanged the rights to NS for design work in the later years pending Symbolics' collapse.

David Tan later re-implemented NS in it's entirety in Common Lisp while working for TLW Inc..