I don't know if this might be useful, but Netlogo is a good program and it is agent oriented. I recommend it to you.

Could you give more details on your question? Are you looking for a modeling or a programming language?

Programming language

OK, the next question is, what kind of application are you looking for? There is a standard in agent technology, the FIPA-standards (Foundation for Intelligent Physical Agents, IEEE standard, http://www.fipa.org) specifying an agent plattform, service directory, agent management, agent communication language. If you are following this standard, there is a very good and established Java-library (JADE, http://jade.tilab.com) which is widely used in research.

If you are looking for simulation of agent systems, then it might be not optimal as you have to build all simulation functions by yourself. For these issues, there is something like NetLogo (http://ccl.northwestern.edu/netlogo/) or SESAM (http://130.243.124.21/sesam/index.php) interesting.

Of course, there are plenty of platforms more than these ... for an overview, please, refer to: http://jasss.soc.surrey.ac.uk/12/2/2.html

I would recommend using JADE. It is a framework implemented in Java.

Thanks Khalid : coming up later on and soon I will publish a paper on Agent Oriented Programming Language , Please look at it

I recommend using Jadex , which is a platform that use java and XML, with other multiple features.