GIFT (Generalized Integrated Fate and transport) is a non-proprietary sediment fate and transport modeling software available within the GEMSS® (Generalized Environmental Modeling System for Surfacewaters) suite of models. GIFT is a numerical modeling system that simulates the fate of dissolved and particulate material discharged from dredging barges, mine tailings, oil well drill cutting mud and produced water into a water body. This three-dimensional particle-based model describes the sediment transport using Lagrangian algorithms and GEMSS' internal hydrodynamic model. The user may specify the mass load rates, release times and locations, particle sizes, settling velocities, and shear stress values (Shields number). The model provides tremendous flexibility to define the discharge scenarios and specific material properties limited only by the computational resources available. Through GEMSS' post-processingfeatures, model output of sedimentation rate, net thickness deposited, and total suspended solids may be plotted and animated. GIFT has been successfully applied to assess potential biological impacts of offshore drilling in the Indian Ocean, North Atlantic off the coast of Africa and in the South China Sea. Safe drilling locations, protective of coral reefs, were determined using GIFT.