The Catalogue of Federal Domestic Assistance contains detailed descriptions of over 2,000 programs.

The United States Department of Housing and Urban Development provides a list of available grants related to housing and urban development programs and projects, and maintains a searchable database of available funding opportunities.

The United States Department of Commerce provides a list of available grants related to business activity and entrepreneurial development, and maintains a searchable database of available funding opportunities.

Federal Grants Database and Information provides information and assistance in identifying and qualifying for available federal government grants, and contains a searchable database of federal funding opportunities organized by subcategory.

Federal Grants Wire is a free resource with information about federal grants, government grants, and loans. The Wire contains a database of over 2,000 federal grants and loans organized in a convenient directory.

Government Grants Online is a free service that will directly email the user a list of government grants available in his/her state. The service operates using a comprehensive database of available funding opportunities and loans.

Grants.gov is a source managed by the federal government providing information and direction in finding and applying for government grants. The service is presently operated by the U.S. Department of Health and Human Services and contains a comprehensive listing of available funding opportunities.

The National Archives provides an updated, searchable database of available funding opportunities in the United States. The National Archives retains one of the most robust search engines available to date.

The Council on Foundations is a national nonprofit association of approximately 2,000 grant-making foundations and corporations that provides leadership expertise, legal services, networking opportunities, and other services to the general public.

The Foundation Center maintains comprehensive databases on U.S. grant-makers and their grants, issuing a wide variety of resources concerning trends in foundation growth and grant-making.

FundsNet Services is an online searchable database of currently available grants organized by subcategory that contains information on hundreds of available funding opportunities.

Funding Links is an up-to-date, comprehensive database of presently available grants and financial support services.

The Federal Register is published by the Office of the Federal Register, National Archives and Records Administration (NARA). The Federal Register is the official daily publication for rules, proposed rules, and notices from federal agencies and organizations, as well as executive orders and other presidential documents.

The Chronicle of Higher Education is a weekly news and grant-information source for college and university faculty members, administrators, and students.

The Chronicle of Philanthropy is a news source for charity leaders, fundraisers, grant-makers, and others involved in philanthropic enterprises.

The United States Department of Energy provides a list of available grants related to alternative energy development, and maintains a searchable database of available funding opportunities.

The Environmental Protection Agency (EPA) provides a list of available grants related to environmental protection and conservation, and maintains a searchable database of available funding opportunities.

The Federal Emergency Management Agency (FEMA) provides a list of available grants related to environmental management and conservation, and maintains a searchable database of available funding opportunities.

Top Environmental Grants is a collection of resources on the grants awarded to environmental organizations in the United States, and provides up-to the minute news on the latest funding opportunities.

The United States Department of Agriculture (USDA) provides a list of available grants related to conservation, agricultural development, and natural sciences. The USDA maintains a searchable database of available funding opportunities.

Natural Resources Conservation Service provides a searchable database of grants to stimulate the development and adoption of innovative conservation approaches and technologies.

Green Building is an Environmental Protection Agency website that provides a list of federal grant opportunities related to energy conservation and “green” energy development.

The United States Department of Education provides a list of available grants related to student, school, and educational development. The Department maintains a searchable database of available funding opportunities.

Education & School Grants is an online searchable database containing dozens of grants and funding opportunities related to education and schooling.

Education Grants is an online searchable database targeted at providing information on education grants and identifying new funding opportunities for organizations, schools, districts, consortia, and state education agencies.

School Grants shares tips, tutorials, and guides on school funding opportunities with PK-12 educators.

Student Aid on the Web is a United States Department of Education website that provides a searchable database of available funding opportunities related to students attending colleges, including career colleges and universities.

Teachers Count provides a list of available grants related to classroom development as well as continuing education and professional development for teachers.

Education Grant provides a database of student and educational development grant opportunities, categorized by availability, content, and type of grant.

Community of Science is a comprehensive source of funding information with more than 25,000 records, representing over 400,000 funding opportunities, worth over $33 billion.

GrantsNet Scientific Grants and Funding is a comprehensive and searchable database of available funding and grant opportunities in the scientific research community.

The National Aeronautics and Space Administration provides a list of available grants related to space and science advancement, and maintains a database of available funding opportunities.

The United States National Science Foundation provides a list of available grants related to scientific and technological research, and maintains a searchable database of available funding opportunities.

The Life Sciences Research Foundation administers an international program of postdoctoral fellowships in all areas of the life sciences.

Life Sciences Discovery Fund provides grant opportunities related to new research initiatives in the life sciences.

National Academies provides grants in order to stimulate the development and of life sciences and technologies. The Academies maintains a searchable database of available funding opportunities.

The National Institutes of Health provides a list of available grants related to medical and health research, and maintains a searchable database of available funding opportunities.

PubMed comprises more than 19 million citations for biomedical literature from MEDLINE, life science journals, and online books, which may include links to full-text content from PubMed Central and publisher web sites.

The Cancer Research Foundation selects multiple cancer research centers to support annually. The Foundation maintains a website with up-to-date information on available funding opportunities and the application process.

The Center for Disease Control (CDC) provides over $7 billion in grants related to medical and scientific research related to disease sciences, and maintains a database of available funding opportunities.

The United States Department of Health and Human Services (HHS) provides a list of available grants related to medical and health sciences advancement, and maintains a searchable database of available funding opportunities.

The Health Resources and Services Administration (HRSA) issues grants to organizations to improve and expand health care services for underserved people, and maintains a searchable database of available funding opportunities.

The Substance Abuse & Mental Health Services Administration (SAMHSA) issues grants to improve and expand mental health care services for needy people. SAMHSA maintains a searchable database of available funding opportunities.

Partners in Information Access for the Public Health Workforce is a collaboration of U.S. government agencies, public health organizations and health sciences libraries. Their website provides a searchable list of opportunities for fellowship, grants and other awards related to public health advancement.

FundsNet Arts Grants is a database of foundation grants available in the arts. The foundations listed contribute hundreds of thousands of dollars annually to the advancement of the arts.

The National Endowment for the Arts Grant issues a number of grants related to the advancement and development of performing and visual arts, and maintains a database of available funding opportunities and grant information.

The National Endowment for the Humanities Grants provides a number of grants related to the advancement and development of the humanities, and maintains a database of available funding opportunities and grant information.

The Social Science Research Council provides a number of grants related to the advancement and development of the social sciences, and maintains a database of available funding opportunities and fellowship information.

The American Council of Learned Societies offers fellowships and grants in more than a dozen programs for research in the humanities and related social sciences at the doctoral and postdoctoral levels.

Humanities Washington's Grant Program provides funding for public programs that have as their primary purpose the exploration and sharing of insights gained from the humanities.

The American Sociological Association provides funding and grants in the interest of advancing sociology as a scientific discipline and profession serving the public good.

The Wenner-Gren Foundation provides funding and grants to support significant and innovative anthropological research into humanity's biological and cultural origins, development and variation and to foster the creation of a community of scholars in anthropology.

The American Association of Law Libraries (AALL) provides financial assistance to law librarians and graduate students who hold promise of future involvement in AALL and the law library profession. Funds are provided by vendors, AALL, and individual members.

The American Library Association provides a number of grants related to the advancement and development of library and digitizing sciences, and maintains a database of available funding opportunities and fellowship information.

The Library and Information Technology Association provides a number of grants related to the advancement and development of library and digitizing sciences, and maintains a database of available funding opportunities and fellowship information.

The Institute of Museum and Library Services Grants provides a number of grants related to the advancement and development of libraries and museums across the United States, and maintains a database of available funding opportunities and fellowship information.

Scholastic provides a database of grant opportunities available to librarians and those interested in advancing literary development.

Library Land provides a list of the major grants, scholarships, and awards available to librarians and those interested in studying the library sciences.

The Association for Library and Information Sciences Education provides funding and grants to support the advancement of library and technical information input professionals.