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.
SMART-TRIAL - SMART-TRIAL is designed for medical device manufacturers who need to generate, store, and share clinical evidence.
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.
secuTrial - Electronic Data Capture – Simple.
Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.