The following list highlights software programs developed by NIEHS. They are open to the public and may be downloaded for free. Biostatistics & Computational Biology Software NIEHS has several resources available to researchers, both inside and outside of the institute. Dextr: Semi-automated Data Extraction Tool An automated tool for extracting data in literature reviews that supports user-verification of entries. Epidemiology The Epidemiology Branch addresses the mission of the NIEHS by carrying out basic and applied research on the effects of the environment on human health. Free Radical Metabolism The Free Radical Metabolism Group studied free radicals, which are atoms or molecules with unpaired electrons in an outer electron shell. Public Electron Paramagnetic Resonance Software Tools NIEHS has produced software for Electron Paramagnetic Resonance analysis since 1983. Find Additional Scientific Resources You found this resource. NIEHS has several other great resources to help scientists with their research.