A plugin provides a set of functionalities you can add to your application. It will bind new components to the Guice context, and may also add scheduled tasks and filters to be able to perform its tasks properly. Each plugin is different and has different needs... Make sure you read the documentation associated with a plugin when you install one!

Note that the plugins with a blue icon are already installed if you use the spincast-default artifact or if you start your application from the Quick Start template! You need to manually install the other ones.