Federal Procurement Data System: FPDS.gov provides detailed information on federal contracts, including contractor names, award amounts, contracting agencies, and procurement trends.
SAM.gov provides information on businesses and organizations registered to receive federal contracts, grants, and assistance, including their eligibility, exclusion status, and award history.
USAspending.gov provides detailed data on federal government spending, including grants, contracts, loans, and financial assistance awarded to businesses, organizations, and agencies.