The Free and Base DEV@cloud subscriptions provide a limited selection of Jenkins/Nectar plugins, the "Essentials" plugins. You cannot add other plugins, nor can you add your own plugins.
Note: For more flexibility and the ability to add other plugins to your Jenkins/Nectar instance, you'll have to upgrade to the "Pro" or "Enterprise" subscription levels.
The current list of DEV@cloud "Essentials" plugins is as follow:
If you think some plugins are missing from the "Essential" list, please let us know.
NOTE: You must install the plugins you wish to use first. Click Manage Jenkins -> Manage Plugins -> Available, and then check the plugins you want to install. Then click the Install button. Once the plugins are installed, click "Restart Jenkins when no jobs are running".
Resources: