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WEAP is a comprehensive software tool for integrated water resources planning used by over 50,000 users in nearly 200 countries. It functions as a database, forecasting tool, and policy analysis system that balances water demand—including use patterns and allocation—with supply factors like streamflow and groundwater. The software features a GIS-based graphical interface and supports scenario-based analysis to evaluate the impacts of climate change, demographic shifts, and policy changes on water systems. It has been applied in diverse global contexts, including projects in China, Rwanda, Colombia, India, Nepal, and California, to support stakeholder dialogue and evaluate environmental flows.

The Long-range Energy Alternatives Planning System (LEAP), developed by the Stockholm Environment Institute, is an integrated modelling tool used in over 150 countries for energy policy analysis and greenhouse gas emission tracking. It supports both demand-side and supply-side methodologies, allowing users to create medium to long-term scenarios (typically 20 to 50 years) to evaluate the environmental and social impacts of various policy options. LEAP is distributed free of charge to academic, governmental, and non-profit organisations in the developing world and is used by more than 85 countries for reporting to the UNFCCC.

The Resources and Energy Analysis Programme (REAP) is a software tool developed by the Stockholm Environment Institute (SEI) to track the environmental consequences of economic activity by analyzing consumption patterns across various spatial scales. It calculates ecological, carbon, and greenhouse gas footprints by combining consumption data with production impacts throughout the supply chain. In the UK, REAP has been applied in over 50 projects, including evaluating regional strategies and creating footprint reduction roadmaps. The tool emphasizes a lifecycle approach, highlighting that consumption-based emissions can exceed production-based emissions due to trade balances, as seen in the UK and Sweden.