GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
ClinicMED - Clinic MED, an open source application for Professional Clinic Management licensed under GPL
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.
Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
ClinCapture - ClinCapture is the only validated electronic data capture software available to sponsors and CROs...
OpenEMR - OpenEMR is an open source electronic health records and medical practice management solution.