These days, after the economic crisis, there are hardly any lenders who will offer you a no down payment loan or a loan without any closing costs. Moreover, in case you get such a lender, he will either ask you to go for a PMI if you can't pay the down payment or will include the closing costs in your loan amount thereby increasing your payments.
I agree with Sussane's point of view. There are hardly any lenders who will offer you a mortgage with no downpayment. Unless you offer 20% downpayment, it will be difficult for you to qualify for a conventional loan. In case of a FHA loan, you need to offer a down payment of 3.5% - 5%.
Yes, there are lenders who will offer you 100% financing. I know this because I am one.
You can qualify for 100% financing if you are active duty military, a veteran or if you live in an area that qualifies for USDA loans.
If any of these apply to you please click on my profile and contact me directly to discuss your options.