Surface Water-Groundwater Simulation
For integrated surface water-groundwater simulation, FEFLOW can be coupled to 
MIKE11 or Hydro_AS-2D. The coupling module to MIKE11 - IfmMIKE11 - is available as a regular product. For the coupling interface to Hydro_AS-2D, please contact our 
support team.
IFM Modules
FEFLOW can be customized by adding modules for the programming interface IFM. These can be coded directly by the user, but also on demand by the DHI-WASY service team. Some of them are even part of the FEFLOW installation.
There are already existing solutions for many applications - please have a look at the lists of existing IFM modules and import/export filters!
Hydro GeoBuilder
Hydro GeoBuilder developed by Schlumberger Water Services provides a flexible and streamlined approach to developing conceptual models for MODFLOW and FEFLOW. Quickly and easily assign flow materials, pumping wells screened over multiple layers, and design complex three-dimensional finite element meshes and grids in a multi-view, graphical environment.
DHI-WASY is reseller for Hydro GeoBuilder in combination with FEFLOW.