The ability to collect data is key to the success of many organizations operating in the developing world. Given the weaknesses of current tools and the surge in mobile phone growth, there's an opportunity for mobile and cloud technologies to enable timely and efficient data collection. This paper discusses Open Data Kit (ODK), a suite of tools that enable efficient and timely data collection on cell phones. ODK is designed to let users own, visualize, and share data without the difficulties of setting up and maintaining servers. The tools are easy to use, deploy, and scale. They also go beyond open source - they're based on open standards and supported by a larger community.