You can add plug-ins to:
Nexaweb application project
Dependencies\plugin directory of another plug-in project
Adding a plug-in to either of these, automatically adds the plug-in libraries to the build path. Nexaweb extracts plug-in libraries to the plugin-lib directory. Nexaweb synchronizes this directory with the WEB-INF\client\plugins directory. If you delete the plugin-lib directory, Nexaweb automatically rebuilds it.