Everyone knows this one, but here it is again:
http://www.agentbuilder.com/AgentTools
List of sites from U. Maryland:
http://agents.umbc.edu/awbookmarks.html
University of Melbourne site:
http://www.cs.mu.oz.au/agentlab/
CMU site, useful for applications:
http://www-2.cs.cmu.edu/~softagents/
NASA/Boeing project (derived from KAoS?)
http://ic.arc.nasa.gov/projects/aen/IA.html
UIUC agent work (Les Gasser):
http://www.isrl.uiuc.edu/~gasser/amag/amag-overview.html
Another list of sites aimed at developers:
http://www.agentland.com/Resources/8How_to_develop_an_agent/Frameworks
-- 
---------------------------------------------
Andrew Cohen
Faculty of Information Technology
University of Technology, Sydney      i
PO Box 123 Broadway
NSW 2007
Australia
     phone    +61-2-9514-7931
     fax    +61-2-9514-1807
eMarkets group: http://www-staff.it.uts.edu.au/~emrktest/eMarket/