NetEpi, which is short for “Network-enabled Epidemiology”, is a project to create a suite of free, open source tools for epidemiology and public health practice. The project web page is at http://www.netepi.org. Anyone with an interest in population health epidemiology or public health informatics is encouraged to examine the prototype tools and to consider contributing to their further development. Contributions which involve formal and/or informal testing of the tools in a wide range of circumstances and environments are particularly welcome, as is assistance with design, programming and documentation tasks.