  We describe in these GLA2011 proceedings the software package LArSoft, a
toolkit to perform simulation, analysis and reconstruction with the Liquid
Argon (LAr) Time Projection Chambers (TPCs) within the US program of proposed
detectors. We demonstrate that LArSoft is a fast-maturing, sophisticated
package which has taken on important analyses already, and which stands ready
to be adopted by as many as five Liquid Argon Time Projection Chambers.
