Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
Wren - Offset your carbon footprint by saving rainforests
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
YAYZY - Track the carbon footprint of each purchase in real-time
OpenClinica - OpenClinica is an open source clinical trials software.
Klima - Go carbon neutral