OpenClinica - OpenClinica is an open source clinical trials software.
SimpleTrials - Web-based clinical trial management system
Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
EtQ Reliance - QMS integrates data to reduce risk and ensure compliance.
FeedbackServer - asp.net survey software Web based and open source software, for purchase or hosted, written in ASP.NET for Nsurvey
Protocol Manager (CTMS) - Protocol Manager (CTMS) is a clinical trial management system that helps users to manage clinical operations and trials of drugs and vaccines in all the phases.