MADS: Model Analysis & Decision Support
WELLS: Analytical simulator of drawdowns caused by multiple pumping wells (originally developed at the University of Mining & Geology in 1992)
MPEST: A LANL-developed parallel version of the code PEST (Doherty 2009)
MPRUN: Parallel execution of a series of independent model runs using POSIX threads (originally developed at the University of Arizona in 1997)