OpenDataKit

Open Data Kit (ODK) community produces open-source, modular toolkit that enables organizations to collect, manage, and use data in resource-constrained environments. ODK is one of the leading data collection solutions available and has been deployed by a wide variety of organizations in dozens of countries around the world. It allows for the collection of data offline and submission of the data when internet connectivity is available. It allows communities to aggregate data with full control over the collected data and the servers where this data is stored.