Samuel D. Crow is the admin of this GitHub organization and handles the documentation mostly.
Among the other contributers are D. M. Coles, who got the compiler up and running initially, and Damien Stuart, who has a lot of experience and intelligent discussions using AmigaE as well.
EEC is a fork of ECX which is Copyright 2002-2010 by Leif Salmonsson and used under various open-source licenses.