Aid from another level of government (intragovernmental aid): in the United States, federal grants may be considered non-tax revenue to the receiving states, and equalization payments
Aid from abroad (foreign aid)
Tribute or indemnities paid by a weaker state to a stronger one, often as a condition of peace after suffering military defeat. The war reparations paid by the defeated Central Powers after the First World War offer a well-known example.
Loans, or other borrowing, from monetary funds and/or other governments
Rents, concessions, and royalties collected by the state when it contracts out the right to profit from some good or service to a private corporation. An example are contracts for resource extraction (for such natural resources as minerals, timber, petroleum and natural gas, or marine resources) collected privately under license from state-owned lands
Fines collected and assets forfeitured as a penalty. Examples include parking fines, court costs levied on criminal offenders