Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
Aventri - Aventri's event management technology has helped thousands of brands globally transform the way they plan and execute meetings and events while tracking and improving their business objectives.
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
OpenClinica - OpenClinica is an open source clinical trials software.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.