Is it possible to deploy on JBoss exploded web application(not archived war file) from Eclipse Galileo?
JBoss Tools supports exploded deployment with both "native" Web Tools(WTP) style projects (i.e. those projects created by the Dynamic Web Project based wizards) and via the generic Project Archives plugins.
If you already got a WTP style project then you simply just need to install jboss tools and create a server from the "JBoss Community" or "JBoss Enterprise Platform" category (The "JBoss" one is the WTP generic server which is very incomplete) and deploy your project to the server and it will by default be deployed exploded.
If you want to deploy in zipped form there is an option for this in the server editor (double click on the server in the server view and look in the deployment section)