(1) the Federal Register at federal register dot gov. (2) grants dot gov. This is the main site where you can search for and apply for grants. (3) individual department websites. (4) the site previously known as the Catalog of Federal Domestic Assistance, now known as “Assistance Listings” at beta dot SAM dot gov. It has good historical information but isn’t the best for new, timely information. (5) Congress dot gov. This is a great resource to look for new legislation containing grant programs.