The short answer is that there really aren't any no down payment loans, except for VA loans, certain loans for homes owned by the VA, or USDA loans (for homes located in eligible rural areas). There may be other loans on certain eligible homes. There are still down payment assistance programs, but they're not always funded, and in a time when city, county, state and federal budgets are being slashed, it won't be easy.
Your best bet is to get online and research programs in your area, or to find homes owned by the VA or located in USDA areas, which I can help you with. Also, I can send you some lenders to talk to that have worked with these programs.
Remember that you'll also have closing costs, although you can ask a seller to pay them, or most of them. You'll also have to prove that you have the funds to close, so you should have some money in the bank. A lender that sees you have very little money in the bank may not see you as a good risk. You'll pay with a higher interest rate, which will make you qualify for less house, or you may be rejected for a loan altogether. They will verify at what your income is, what your expenses are, what your credit looks like, etc.
But, yes you can buy a home with no down payment, it just won't be easy, and you'll have competition. let me know if I can help get you started.