EJSCREEN: The United States Environmental Protection Agency (EPA) released the first public version of EJSCREEN in 2015, as a web-based tool for environmental justice mapping and screening. It was an award-winning project that quickly grew into a widely-used tool. EJSCREEN provided a wealth of data — demographic and environmental indicators, combined into “EJ Indexes” — for all block groups in the United States. It allowed anyone with access to the internet to see maps of their neighborhood and the surrounding area. It also made it easy to see a report on any selected location, providing environmental indicators and socioeconomic/demographic data for local residents. It put these in perspective by comparing them to data on the whole State or the US overall.

EJAM: Around 2024, a tool called EJAM added new capabilities. The Environmental and Residential Population Analysis Multisite tool (EJAM) lets you easily and quickly see residential population and environmental information aggregated within and across hundreds or thousands of places, all at the same time.

Public/non-EPA versions of EJSCREEN and EJAM: In February 2025, EPA stopped hosting these, after which other organizations & individuals worked to develop and host their own public versions of an EJSCREEN web app and an EJAM web app. EPA had no plans to fund further development and maintenance of these software tools, and instead, the open source (MIT license) code and data that had supported the tools allowed any interested outside parties the opportunity to pursue new collaborative efforts. These may lead to new features and tools developed in shared open source projects such as public version of an EJAM R package.