Federal Grants

Grants.gov is the definitive source to find and apply for a federal grant.
USASpending.gov lets you track Federal Grants and Contracts in your community. The site will be improved in the next few years so that tracking federal funds is easier and information is more complete down to the smallest grant awards on local levels.
Catalog of Federal Domestic Assistance (CFDA) - This searchable database contains detailed program descriptions for 2,063 federal assistance programs.
Federal Business Opportunities - the electronic procurement site for all federal agencies; best place to begin research on federal procurement opportunities.
The Finance Project’s Information Resource Center - a specialized non-profit research, consulting, technical assistance and training firm for public and private sector leaders nationwide.
Recovery.Gov created for the American Recovery and Reinvestment Act of 2009, displays information about the Recovery Accountability and Transparency Board's activities, as well as data related to the $840 billion stimulus bill and information about the distribution and spending of Hurricane Sandy funds. tracks where federal grant and contract dollars are being spent in Maryland and all states.
The U.S. Office of Electronic Government and Technology assists the Office of Management and Budget and provides many good links for businesses interested in using the internet to access information about procurement opportunities.