SurveyCTO - Collect data you can trust Offline or online, in the field, on the street, or in the lab.
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
CommCare - The digital platform for impactful frontline work everywhere
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.
Ona - Mobile Data Collection solution and application that empowers field teams. Ona provides a web and mobile app that allows the monitoring of real time field data both online and offline.
drchrono - An EHR built for your specialty: