Note: These are first time home buyer and home buying resources in Harris County and Houston, TX that I have had clients work with and those I simply sourced for you to review as a first time home buyer. They are not validated and I make no promises on their current availability or success with your individual needs. These are strictly for your research.
Texas Department of Housing and Community Affairs: My First Texas Home (TMP 79). http://www.tdhca.state.tx.us/homeownership/fthb/down-payment-assistance.htm
Wells Fargo NeighborhoodLIFT Progam (limited funds available per their website). The program supplies downpayment assistance and financial education. https://www.wfhmconsumerevents.com/aspx/Events/Brochure.aspx?t=1&EventID=5922
City of Houston Home Buyer Assistance Program http://www.houstontx.gov/housing/resource.html
Harris County Housing Down Payment Assistance Program (DAP): Stipulations include (but are not limited to) first time homebuyer, live in the home for 5 years, meet income requirements, and be in an unincorporated area of Harris County. http://www.hrc.hctx.net/dap.htm