These are generally the most reliable. Organizations like the National Council of State Housing Agencies list programs for every state.
They often come with higher interest rates on your primary mortgage. You also have to deal with "income caps"—if you make too much money for your area, you’re disqualified. Top-Rated Program Types grant money to buy a house
Most homebuying grants are from the federal government. Instead, they are typically state or local programs that act as "Down Payment Assistance" (DPA). These are generally the most reliable