FreePOPs core and some plugins are developed by:

 Enrico Tassi <gareuselesinge@users.sourceforge.net>
 Nicola Cocchiaro <ncocchiaro@users.sourceforge.net>
 Simone Vellei <simone_vellei@users.sourceforge.net>
 Alessio Caprari <alessiofender@users.sourceforge.net> 
 Russell Schwager <russell822@users.sourceforge.net>

Really important contributions like code, plugins, translations from:

 Rami Kattan <rkattan@users.sourceforge.net>
 Pegasus <p3g4sus@users.sourceforge.net>
 Eddi De Pieri <dpeddi@users.sourceforge.net>
 Lisardo Bello <lisar314@users.sourceforge.net>