The Homeless Resource Hotline is a toll-free number that provides up-to-date information on available resources for the homeless, including soup kitchens and beds. The hotline was built by Mahmood using Twilio's API and Google App Engine, and it uses public Google calendars to distribute business cards with the hotline number. With $500 in Twilio credit, Mahmood plans to expand the service to other cities, encourage organizations to maintain their own online calendars, and reach out to homeless organizations in New York City and San Francisco. The application takes only two days to create and has been well-received by users, who appreciate its simplicity and ease of use.