MCNP
Monte Carlo N-Particle code developed at the Los Alamos National Laboratory.

SCALE/KENO
Standardized Computer Analysis for Licensing Evaluation code developed at Oak Ridge National Laboratory.

DANTSYS
Diffusion Accelerated Neutral particle Transport System code developed at the Los Alamos National Laboratory. A Primer for Criticality Calculations with DANTSYS is available.

MONK
A Monte Carlo program for nuclear criticality safety and reactor physics analyses.