Everything published by the Federal government is free of any copyright restrictions. The research, reports and websites can be useful resources for classes when creating your own course material.
DATA.GOV - is the central repository for the US Government's open data. The machine readable data setrs contain both raw ans geospatial data in a variety of formats.
- A great starting place to search is USA.gov.
- Try to search a specific agency's website. A-Z List of Federal Agencies. Many times these materials are not retrieved with simple Google searches. Here are some examples of US Federal Databases.
The Homeland Security Digital Library is a collection of documents related to homeland security policy, strategy, and organizational management. Topics include maritime, unmanned aerial systems, terrorism, epidemics and many more.
datacatalogs.org - contains comprehensive listings for open data catalogs in the world. The content is curated by leading world open data experts including representatives from local, regional and national governments, international organizations such as the World Bank and numerous NGOs.
SciTech Connect is a collection of science, technology, and engineering research information from the U.S. Department of Energy.