OpenClinica - OpenClinica is an open source clinical trials software.
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
Clinical Conductor CTMS - Clinical Conductor is designed to accommodate the unique needs of organization & conduct clinical research.
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.
Longboat - Cloud-based clinical trial management
drchrono - An EHR built for your specialty: