An easy method to build geologically realistic models of natural fracture networks in geological formations, by simulating the processes of fracture nucleation, growth and interaction, based on geomechanical principles and an understanding of the geological history of the structure. The code is written in C# and is provided with two interfaces: A standalone interface with text file input and output, that can be compiled in standard C# and can run simple models. A plug-in interface for the Petrel geomodelling package from Schlumberger, that can run more complex models of real geological structures. v2.0.0 is the first public release; major enhancements from v1 include support for oblique and strike-slip fractures and calculation of the bulk rock compliance tensor.