CRT Foundation
www.fondazionecrt.it

ISI Foundation
www.isi.it

Network of excellence on complex systems
www.complexityscience.org

Santa Fe Institute
www.santafe.edu

Publication in Italian in the "Quantum" magazine, published by The Russian Academy of Sciences
www.minimazione.it

Multi Agent
http://www.red3d.com/cwr/ibm.html

Agent-based computational economics
http://www.econ.iastate.edu/tesfatsi/ace.htm

The Use of Complexity Science in USA
http://www.complexsys.org/pdf/ComplexityScienceSurvey.pdf