FRACGEN/NFFLOW is a DOE sponsored project to simulate the behavior of tight, fractured, strata-bound reservoirs that arise from irregular, discontinuous, or clustered networks of fractures. This distribution includes the PC programs and user interfaces for fracture network generation, discrete fracture reservoir simulation, and visualization of fracture networks and reservoir performance. New features in this release are optional fixed pressure boundary conditions, permeable unfractured layers, liquid data handling, sorption, and stress sensitive aperture modeling.