SLAMMER — The Complete Guide: Earthquake Slope Displacement with Newmark Analysis
USGS SLAMMER estimates how far a slope, embankment or earth dam slides in an earthquake using sliding-block methods, with a built-in record library. Free.
Guides and Articles
SUTRA — The Complete Guide: Seawater Intrusion, Variable-Density Flow and Heat Transport
USGS SUTRA is a finite-element model for saturated–unsaturated, variable-density groundwater flow with solute or heat transport, used for seawater intrusion.
GSFLOW — The Complete Guide: Coupled Surface-Water and Groundwater Modelling for Whole Basins
USGS GSFLOW couples PRMS with MODFLOW to compute water exchange between streams, lakes and the aquifer in one run. Public domain, for Windows and Linux.
MODPATH — The Complete Guide: Flow Paths and Well Capture Zones from MODFLOW
USGS MODPATH tracks water particles through MODFLOW results to map flow paths, travel times and well capture zones. Public domain, free for commercial use too.
MT3D-USGS — The Complete Guide: Simulating Groundwater Contaminant Plumes with MODFLOW
MT3D-USGS simulates solute and contaminant transport in groundwater from a MODFLOW flow field: plumes, reactions and pump-and-treat. Public domain, no GUI.
PeakFQ — The Complete Guide: Flood-Frequency Analysis and Design Floods from Gauge Data
USGS PeakFQ fits a flood-frequency curve to annual peak flows under Bulletin 17C, giving return-period discharges and confidence limits in a browser or in R.
StreamStats — The Complete Guide: Watershed Delineation and Flow Estimates in One Click
USGS StreamStats delineates a drainage basin from one click on a stream and estimates basin traits and peak and low flows. Free, in a browser, US basins only.
FLORIS — The Complete Guide: Wind-Farm Wake and Yield Modelling in Python
FLORIS is an open-source Python library, formerly from NREL, that models wakes between wind turbines, estimates annual yield, tests layouts and wake steering.
Athena Impact Estimator — The Complete Guide: Free Whole-Building Life Cycle Assessment
Athena Impact Estimator calculates the environmental impact of a whole building or assembly by life cycle assessment: global warming potential and more. Free.
ENERGY STAR Portfolio Manager — The Complete Guide: Tracking and Benchmarking Building Energy
Portfolio Manager from the EPA is a free online tool to track energy, water, waste and emissions in one building or a portfolio, with targets and reports.
REScheck — The Complete Guide: IECC Energy-Code Compliance for Homes
REScheck from the US DOE calculates U×A for each envelope assembly of a home, compares the total with the IECC requirement and prints a compliance report. Free.
COMcheck — The Complete Guide: Energy-Code Compliance for Commercial Buildings
COMcheck from the US DOE checks commercial building envelope, lighting and mechanical systems against IECC and ASHRAE 90.1 and prints a ready report. Free.