Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
Sli.do - Slido is the ultimate Q&A and polling platform for live and virtual meetings and events. It offers interactive Q&A, live polls and insights about your audience.
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
Poll Everywhere - Audience response system that uses mobile phones, twitter, and the web. Responses are displayed in real-time on gorgeous charts in PowerPoint, Keynote, or web browser.
OpenClinica - OpenClinica is an open source clinical trials software.
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.