FreeHealth is a fork of FreeMedForms, a free and open source project launched in 2008 by Dr Eric Maeker. Eric Maeker was the main developer of FreeMedForms from 2008 to 2015. FreeHealth wouldn't exist without his tremendous work and dedication: he wrote 80% of FreeHealth code.
Christian A. Reiter, Pierre-Marie Desombre, Guillaume Denry also made significant contributions to the code. Many others contributed to the project: read the full list here: http://freemedforms.com/team